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Bruun SB, Madsen JB, Brasen CL. Establishing reference intervals for soluble urokinase plasminogen activator receptor in Northern European adults. Pract Lab Med 2024; 39:e00371. [PMID: 38404526 PMCID: PMC10884968 DOI: 10.1016/j.plabm.2024.e00371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 02/15/2024] [Indexed: 02/27/2024] Open
Abstract
Objectives Soluble urokinase plasminogen activator receptor (suPAR) may have untapped potential in clinical diagnostics. Previous studies determined reference intervals using an enzyme-linked immunoassay, but there is a need for reference intervals using a faster assay if the analysis is to be used in emergency medicine. The current study aims to determine reference intervals for suPAR using a fully automated particle-enhanced turbidimetric immunoassay (PETIA) according to the Clinical and Laboratory Standards Institute guideline A28-A3c. Design and methods Blood samples were prospectively collected from Danish blood donors. Plasma suPAR was analyzed on the cobas 8000 module c502 in an open channel using a PETIA. Sex-partitioned reference intervals were determined using a parametric quantile approach. Results The study included 241 participants-123 females and 118 males. The common reference interval for suPAR was 1.56-4.11 ng/mL (95% confidence intervals (CI) for the lower and upper limits were 1.56-1.63 and 3.81-4.47, respectively). The reference interval for females was 1.59-4.65 ng/mL (95% CIs 1.48-1.70 and 4.09-5.48, respectively) and for males, 1.56-3.59 ng/mL (95% CIs 1.47-1.65 and 3.31-3.93, respectively). Conclusions Our results support using sex-partitioned reference intervals for suPAR and provide a basis for future studies using the PETIA method.
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Affiliation(s)
- Stine Bakkensen Bruun
- Biochemistry and Immunology, Lillebaelt Hospital, University Hospital of Southern Denmark, Beriderbakken 4, 7100, Vejle, Denmark
| | - Jeppe Buur Madsen
- Biochemistry and Immunology, Lillebaelt Hospital, University Hospital of Southern Denmark, Beriderbakken 4, 7100, Vejle, Denmark
| | - Claus Lohman Brasen
- Biochemistry and Immunology, Lillebaelt Hospital, University Hospital of Southern Denmark, Beriderbakken 4, 7100, Vejle, Denmark
- Department of Regional Health Research, University of Southern Denmark, J. B. Winsløwsvej 19, 5000, Odense, Denmark
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Rehan ST, Hussain HU, Ali E, Kumar KA, Tabassum S, Hasanain M, Shaikh A, Ali G, Yousaf Z, Asghar MS. Role of soluble urokinase type plasminogen activator receptor (suPAR) in predicting mortality, readmission, length of stay and discharge in emergency patients: A systematic review and meta analysis. Medicine (Baltimore) 2023; 102:e35718. [PMID: 37960735 PMCID: PMC10637562 DOI: 10.1097/md.0000000000035718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 09/28/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Soluble urokinase plasminogen activator receptor (suPAR) is an inflammatory biomarker that is used to predict mortality, readmission, early discharge, and LOS, thus, serves as a useful tool for ED physicians. Our study aims to analyze the efficacy of suPAR in predicting these prognostic markers in ED. METHODS We performed a comprehensive search on 6 databases from the inception to 30th November 2022, to select the following eligibility criteria; a) observation or triage trial studies investigating the role of suPAR levels in predicting: 30 day and 90-day mortality, 30-day readmission, early discharge (within 24hr), and LOS in patients coming to AMU. RESULTS A total of 13 studies were included, with a population size of 35,178, of which 52.9% were female with a mean age of 62.93 years. Increased risk of 30-day mortality (RR = 10.52; 95% CI = 4.82-22.95; I2 = 38%; P < .00001), and risk of 90-day mortality (RR = 5.76; 95% CI = 3.35-9.91; I2 = 36%; P < .00001) was observed in high suPAR patients. However, a slightly increased risk was observed for 30-day readmission (RR = 1.50; 95% CI = 1.16-1.94; I2 = 54%; P = .002). More people were discharged within 24hr in the low suPAR level group compared to high suPAR group (RR = 0.46; 95% CI = 0.40-0.53; I2 = 41%; P < .00001). LOS was thrice as long in high suPAR level patients than in patients with low suPAR (WMD = 3.20; 95% CI = 1.84-4.56; I2 = 99%; P < .00001). CONCLUSION suPAR is proven to be a significant marker in predicting 30-day and 90-day mortality in ED patients.
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Affiliation(s)
| | | | - Eman Ali
- Dow University of Health Sciences, Karachi, Pakistan
| | | | | | | | - Asim Shaikh
- Department of Medicine, The Aga Khan University, Karachi, Pakistan
| | - Gibran Ali
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic - Rochester, NY, USA
| | - Zohaib Yousaf
- Department of Internal Medicine, Tower Health - Reading Hospital, PA, USA
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Mitsunaga T, Ohtaki Y, Yajima W, Sugiura K, Seki Y, Mashiko K, Uzura M, Takeda S. Ability of combined soluble urokinase plasminogen activator receptor to predict preventable emergency attendance in older patients in Japan: a prospective pilot study. PeerJ 2022; 10:e14322. [PMID: 36353607 PMCID: PMC9639425 DOI: 10.7717/peerj.14322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 10/10/2022] [Indexed: 11/06/2022] Open
Abstract
Soluble urokinase plasminogen activator receptor (suPAR) is a strong and nonspecific inflammatory biomarker that reflects various immunologic reactions, organ damage, and risk of mortality in the general population. Although prior research in acute medical patients showed that an elevation in suPAR is related to intensive care unit admission and risk of readmission and mortality, no studies have focused on the predictive value of suPAR for preventable emergency attendance (PEA). This study aims to evaluate the predictive value of suPAR, which consists of a combination of white blood cell count (WBC), C-reactive protein (CRP), and the National Early Warning Score (NEWS), for PEA in older patients (>65 years) without trauma who presented to the emergency department (ED). This single-center prospective pilot study was conducted in the ED of the Association of EISEIKAI Medical and Healthcare Corporation Minamitama Hospital, in Hachiouji City, Tokyo, Japan, from September 16, 2020, to June 21, 2022. The study included all patients without trauma aged 65 years or older who were living in their home or a facility and presented to the ED when medical professionals decided an emergency consultation was required. Discrimination was assessed by plotting the receiver-operating characteristic (ROC) curve and calculating the area under the ROC curve (AUC). During the study period, 49 eligible older patients were included, and thirteen (26.5%) PEA cases were detected. The median suPAR was significantly lower in the PEA group than in the non-PEA group (p < 0.05). For suPAR, the AUC for the prediction of PEA was 0.678 (95% CI 0.499-0.842, p < 0.05), and there was no significant difference from other variables as follows: 0.801 (95% CI 0.673-0.906, p < 0.001) for WBC, 0.833 (95% CI 0.717-0.934, p < 0.001) for CRP, and 0.693 (95% CI 0.495-0.862, p < 0.05) for NEWS. Furthermore, the AUC for predicting PEA was 0.867 (95% CI 0.741-0.959, p < 0.001) for suPAR + WBC + CRP + NEWS, which was significantly higher than that of the original suPAR (p < 0.01). The cutoff values, sensitivity, specificity, and odds ratio of suPAR and suPAR + WBC + CRP + NEWS were 7.5 and 22.88, 80.6% and 83.3%, 53.8% and 76.9%, and 4.83 and 16.67, respectively. This study has several limitations. First, this was pilot study, and we included a small number of older patients. Second, the COVID-19 pandemic occurred during the study period, so that there may be selection bias in the study population. Third, our hospital is a secondary emergency medical institution, and as such, we did not treat very fatal cases, which could be another cause of selection bias. Our single-center study has demonstrated the moderate utility of the combined suPAR as a triage tool for predicting PEA in older patients without trauma receiving home medical care. Before introducing suPAR to the prehospital setting, evidence from multicenter studies is needed.
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Affiliation(s)
- Toshiya Mitsunaga
- Department of Emergency Medicine, Jikei University School of Medicine, Tokyo, Japan,Department of Emergency Medicine, Association of EISEIKAI Medical and Healthcare Corporation Minamitama Hospital, Tokyo, Japan
| | - Yuhei Ohtaki
- Department of Emergency Medicine, Jikei University School of Medicine, Tokyo, Japan
| | - Wataru Yajima
- Department of Emergency Medicine, Jikei University School of Medicine, Tokyo, Japan
| | - Kei Sugiura
- Department of Emergency Medicine, Jikei University School of Medicine, Tokyo, Japan
| | - Yutaka Seki
- Department of Emergency Medicine, Association of EISEIKAI Medical and Healthcare Corporation Minamitama Hospital, Tokyo, Japan
| | - Kunihiro Mashiko
- Department of Emergency Medicine, Association of EISEIKAI Medical and Healthcare Corporation Minamitama Hospital, Tokyo, Japan
| | - Masahiko Uzura
- Department of Emergency Medicine, Jikei University School of Medicine, Tokyo, Japan
| | - Satoshi Takeda
- Department of Emergency Medicine, Jikei University School of Medicine, Tokyo, Japan
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Griveas I, Pratilas E. Soluble urokinase plasminogen activator receptor and its complicated role in hemodialysis (HD) patients with Covid-19 infection. Transfus Apher Sci 2022:103590. [PMID: 36376211 PMCID: PMC9616477 DOI: 10.1016/j.transci.2022.103590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKROUND Soluble urokinase plasminogen receptor (suPAR) is a protein in the blood that has been described to reflect the severity status of systemic inflammation. AIMS AND OBJECTIVE We investigated the association between admission suPAR levels and severity and outcome of HD patients with Covid-19 infection. MATERIALS AND METHODS In an observational study of adult HD patients hospitalized for Covid-19, we measured suPAR levels in plasma samples. The time table for those measurements were as follows: at the beginning of admission, after a hemoperfusion (HP) session for those patients that received them, and just before discharge. RESULTS Of the 17 patients (7 were male), 13 patients received HP (mean age: 74 years old). The median suPAR level was 12.94 ng/ml. For those who undertook HP in HD unit the median suPAR level before the session was 12.95 ng/mil and 6.2 ng/ml at the end of each session (p < 0.05). 3 patients had a suPAR level below 7 ng/ml. 2 of them survived without developing pleural effusions. 7 patients were discharged from the hospital with median suPAR level 12.08 ng/ml which did not differ significantly from the median suPAR level of the deceased ones (13.68 ng/ml). CONCLUSION Admission levels of suPAR in HD patients hospitalized for Covid-19 do not seem to be predictive for their clinical course in general. Chronic Kidney Disease and its relation to suPAR independently of patients' inflammation status may be the key component for our notice. Despite that, in patients where low levels of suPAR combined with absence of pleural effusions the prognosis was excellent.
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Affiliation(s)
- Ioannis Griveas
- Nephrology Department, Army Share Fund Hospital of Athens, 417 NIMTS, Greece.
| | - Evaggelos Pratilas
- Nephrology Department, Army Share Fund Hospital of Athens, 417 NIMTS, Greece
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Soluble Urokinase Plasminogen Activator Receptor (suPAR) in the Emergency Department (Ed): A Tool for the Assessment of Elderly Patients. J Clin Med 2022; 11:jcm11123283. [PMID: 35743359 PMCID: PMC9224884 DOI: 10.3390/jcm11123283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 12/10/2022] Open
Abstract
Emergency department (ED) overcrowding is a global issue setting challenges to all care providers. Elderly patients are frequent visitors of the ED and their risk stratification is demanding due to insufficient assessment methods. A prospective cohort study was conducted to determine the risk-predicting value of a prognostic biomarker, soluble urokinase plasminogen activator receptor (suPAR), in the ED, concentrating on elderly patients. SuPAR levels were determined as part of standard blood sampling of 1858 ED patients. The outcomes were assessed in the group of <75 years (=younger) and ≥75 years (=elderly). The elderly had higher median suPAR levels than the younger (5.4 ng/mL vs. 3.7 ng/mL, p < 0.001). Increasing suPAR levels were associated with higher probability for 30-day mortality and hospital admission in all age groups. SuPAR also predicted 30-day mortality when adjusted to other clinical factors. SuPAR acts successfully as a nonspecific risk predictor for 30-day mortality, independently and with other risk-assessment tools. Low suPAR levels predict positive outcomes and could be used in the discharging process. A cut-off value of 4 ng/mL could be used for all ED patients, 5 ng/mL being a potential alternative in elderly patients.
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Holstein RM, Mäkinen MT, Castrén MK, Kaartinen JM. Utilization of Prognostic Biomarker Soluble Urokinase Plasminogen Activator Receptor in the Emergency Department: A Tool for Safe and More Efficient Decision-making. Biomark Insights 2022; 17:11772719221081789. [PMID: 35295966 PMCID: PMC8918965 DOI: 10.1177/11772719221081789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/31/2022] [Indexed: 12/04/2022] Open
Abstract
Introduction: Risk stratification in the emergency departments (EDs) is in critical need for new applications due to ED overcrowding and hospitalization of older people. We aimed to evaluate the expediency, efficiency and safety of a prognostic biomarker, soluble urokinase plasminogen activator receptor (suPAR), as a tool for the risk assessment of patients arriving at the ED. Methods: We performed a comparative cross-sectional study in 2 emergency departments (EDs), suPAR measurements being incorporated into routine blood sampling in the intervention ED. The primary outcome was the number of discharges from the ED. The importance of the outcomes was examined by appropriate multi- or bivariate analysis. Results: The absolute and relative number of discharges were similar between the intervention and control groups [121 (55.3%) vs 62 (55.9%)]. No significant differences between the groups were seen in the length of stays in the ED. Patients with low suPAR values were more likely discharged and patients with high suPAR values more likely admitted to hospital. Two admitted patients with low suPAR values could have been discharged safely. Conclusion: The utilization of suPAR did not increase the risk for neither positive nor negative outcomes. Low suPAR values could be potential in discharging more patients safely. Instead of unselected patient populations, the benefits of suPAR measurements in the ED could emerge in the assessment of a more precisely determined and selected group of patients.
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Affiliation(s)
- Ria M Holstein
- Department of Emergency Medicine and Services, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Marja T Mäkinen
- Department of Emergency Medicine and Services, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Maaret K Castrén
- Department of Emergency Medicine and Services, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Johanna M Kaartinen
- Department of Emergency Medicine and Services, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
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Rubio Díaz R, de Rafael González E, Martín Torres E, Valera Núñez E, López Martos AM, Melguizo Melguizo D, Picazo Perea MP, López García PJ, Fuentes Bullejos P, Chafer Rudilla M, Carretero Gómez JF, Julián-Jiménez A. [Prognostic power of soluble urokinase plasminogen activator receptor (suPAR) for short-term mortality in patients seen in Emergency Departments due to infections]. REVISTA ESPANOLA DE QUIMIOTERAPIA : PUBLICACION OFICIAL DE LA SOCIEDAD ESPANOLA DE QUIMIOTERAPIA 2022; 35:50-62. [PMID: 34859658 PMCID: PMC8790637 DOI: 10.37201/req/108.2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/21/2021] [Accepted: 10/30/2021] [Indexed: 06/13/2023]
Abstract
OBJECTIVE To analyse and compare 30-day mortality prognostic power of several biomarkers (C-reactive protein, procalcitonin, lactate and suPAR) in patients seen in emergency departments (ED) due to infections. Secondly, if these could improve the accuracy of systemic inflammatory response syndrome (SIRS) and quick Sepsis-related Organ Failure Assessment (qSOFA). METHODS A prospective, observational and analytical study was carried out on patients who were treated in an ED of one of the eight participating hospitals. An assessment was made of 32 independent variables that could influence mortality at 30 days. They covered epidemiological, comorbidity, functional, clinical and analytical factors. RESULTS The study included 347 consecutive patients, 54 (15.6%) of whom died within 30 days of visiting the ED. SUPAR has got the best biomarker area under the curve (AUC)-ROC to predict mortality at 30 days of 0.836 (95% CI: 0.765-0.907; P <.001) with a cut-off > 10 ng/mL who had a sensitivity of 70% and a specificity of 86%. The score qSOFA ≥ 2 had AUC-ROC of 0.707 (95% CI: 0.621-0.793; P < .001) with sensitivity of 53% and a specificity of 89%. The mixed model (suPAR > 10 ng/mL plus qSOFA ≥ 2) has improved the AUC-ROC to 0.853 [95% CI: 0.790-0.916; P < .001] with the best prognostic performance: sensitivity of 39% and a specificity of 97% with a negative predictive value of 90%. CONCLUSIONS suPAR showed better performance for 30-day mortality prognostic power from several biomarkers in the patients seen in ED due to infections. Score qSOFA has better performance that SRIS and the mixed model (qSOFA ≥ 2 plus suPAR > 10 ng/mL) increased the ability of qSOFA.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - A Julián-Jiménez
- Agustín Julián-Jiménez, Servicio de Urgencias-Coordinador de Docencia, Formación, Investigación y Calidad. Complejo Hospitalario Universitario de Toledo, Toledo, Spain.
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Velissaris D, Zareifopoulos N, Karamouzos V, Pierrakos C, Karanikolas M. Soluble urokinase plasminogen activator receptor (suPAR) in the emergency department: An update. CASPIAN JOURNAL OF INTERNAL MEDICINE 2022; 13:650-665. [PMID: 36420338 PMCID: PMC9659827 DOI: 10.22088/cjim.13.4.650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 11/17/2021] [Accepted: 12/05/2021] [Indexed: 06/16/2023]
Abstract
BACKGROUND The biomarker soluble urokinase plasminogen activator receptor (suPAR) is an indicator of inflammation which is increased in a variety of chronic and acute disease states. Its most promising application in the emergency setting is to aid in the prognostic stratification of patients by identifying those at high risk of deterioration. This is a narrative review of studies evaluating the use of suPAR. METHODS We conducted a Medline search for studies on the use of suPAR in patients acutely admitted to the emergency department. RESULTS 25 original studies were included in the review. suPAR as a marker of inflammation has been used alone or combined to other inflammatory biomarkers in the assessment of patients suffering from various acute and chronic diseases in an emergency setting. As it is non-specific, it may increase in infectious disease, malignancy or acute coronary syndromes among other conditions, but quantitative suPAR levels correlate with disease severity. It may be useful for the identification of high risk patients regardless of underlying pathology. CONCLUSION As the ideal biomarker in the emergency setting has not been identified yet, suPAR may be a promising addition to the established biomarkers for the initial assessment of patients in this setting. Additional research is necessary to evaluate the usefulness of suPAR guided management algorithms.
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Affiliation(s)
| | | | | | - Charalampos Pierrakos
- Department of Intensive Care, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Menelaos Karanikolas
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO, USA
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Enocsson H, Idoff C, Gustafsson A, Govender M, Hopkins F, Larsson M, Nilsdotter-Augustinsson Å, Sjöwall J. Soluble Urokinase Plasminogen Activator Receptor (suPAR) Independently Predicts Severity and Length of Hospitalisation in Patients With COVID-19. Front Med (Lausanne) 2021; 8:791716. [PMID: 34926532 PMCID: PMC8674575 DOI: 10.3389/fmed.2021.791716] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 11/12/2021] [Indexed: 01/07/2023] Open
Abstract
Background: Efficient healthcare based on prognostic variables in hospitalised patients with COVID-19 could reduce the risk of complications and death. Recently, soluble urokinase Plasminogen Activator Receptor (suPAR) was shown to predict respiratory failure, kidney injury, and clinical outcome in patients with SARS-CoV-2 infection. The aim of this study was to investigate the value of suPAR as a prognostic tool, in comparison with other variables, regarding disease severity and length of hospital stay in patients with COVID-19. Patients and Methods: Individuals hospitalised with COVID-19 (40 males, 20 females; median age 57.5 years) with a median symptom duration of 10 days and matched, healthy controls (n = 30) were included. Admission levels of suPAR were measured in serum by enzyme-linked immunosorbent assay. Blood cell counts, C-reactive protein (CRP) levels, lactate dehydrogenase (LDH), plasma creatinine and estimated glomerular filtration rates were analysed and oxygen demand, level of care and length of hospitalisation recorded. Results: Patients had significantly higher suPAR levels compared to controls (P < 0.001). Levels were higher in severely/critically (median 6.6 ng/mL) compared with moderately ill patients (median 5.0 ng/mL; P = 0.002). In addition, suPAR levels correlated with length of hospitalisation (rho = 0.35; P = 0.006). Besides suPAR, LDH, CRP, neutrophil count, neutrophil-to-monocyte and neutrophil-to-lymphocyte ratio, body mass index and chronic renal failure were discriminators of COVID-19 severity and/or predictors of length of hospitalisation. Conclusion: Admission levels of suPAR were higher in patients who developed severe/critical COVID-19 and associated with length of hospital stay. In addition, we showed that suPAR functioned as an independent predictor of COVID-19 disease severity.
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Affiliation(s)
- Helena Enocsson
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Cornelia Idoff
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Annette Gustafsson
- Department of Infectious Diseases, The Vrinnevi Hospital, Norrköping, Sweden
| | - Melissa Govender
- Division of Molecular Medicine and Virology, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Francis Hopkins
- Division of Molecular Medicine and Virology, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Marie Larsson
- Division of Molecular Medicine and Virology, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Åsa Nilsdotter-Augustinsson
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Johanna Sjöwall
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden,Department of Infectious Diseases, The Vrinnevi Hospital, Norrköping, Sweden,*Correspondence: Johanna Sjöwall
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Santeri S, Peter AA, Kristiina N, Jesper EO, Harri H. suPAR cut-offs for stratification of low, medium, and high-risk acute medical patients in the emergency department. BMC Emerg Med 2021; 21:149. [PMID: 34844557 PMCID: PMC8628287 DOI: 10.1186/s12873-021-00544-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 11/21/2021] [Indexed: 12/13/2022] Open
Abstract
Background Soluble urokinase plasminogen activator receptor (suPAR) levels have previously been associated with readmission and mortality in acute medical patients in the ED. However, no specific cut-offs for suPAR have been tested in this population. Methods Prospective observational study of consecutively included acute medical patients. Follow-up of mortality and readmission was carried out for 30- and 90 days stratified into baseline suPAR < 4, 4–6 and > 6 ng/ml. suPAR levels were measured using suPARnostic® Turbilatex assay on a Cobas c501 (Roche Diagnostics Ltd) analyser. Results A total of 1747 acute medical patients in the ED were included. Median age was 70 (IQR: 57–79) and 51.4% were men. Adjusted linear regression analysis showed that suPAR, independently of age, sex and C-reactive protein levels, predicted 30- and 90-day mortality (Odds ratio for doubling in suPAR 1.96 (95% confidence intervals: 1.42–2.70) Among patients with suPAR below 4 ng/ml (N = 804, 46.0%), 8 (1.0%) died within 90-day follow-up, resulting in a negative predictive value of 99.0% and a sensitivity of 94.6%. Altogether 514 (29.4%) patients had suPAR of 4–6 ng/ml, of whom 43 (8.4%) died during 90-day follow-up. Among patients with suPAR above 6 ng/ml (N = 429, 24.6%), 87 patients (20.3%) died within 90-day follow-up, resulting in a positive predictive value of 20.1% and a specificity of 78.7%. Conclusions suPAR cut-offs of below 4, between 4 and 6 and above 6 ng/ml can identify acute medical patients who have low, medium or high risk of 30- and 90-day mortality. The turbidimetric assay provides suPAR results within 30 min that may aid in the decision of discharge or admission of acute medical patients.
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Affiliation(s)
- Seppälä Santeri
- South Savo Social- and Healthcare District, Mikkeli Central Hospital, Mikkeli, Finland.
| | - Andersen Andreas Peter
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Nyyssönen Kristiina
- Eastern Finland Laboratory Centre Joint Authority Enterprise (ISLAB), South Savo District Laboratory, Mikkeli, Finland
| | - Eugen-Olsen Jesper
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Hyppölä Harri
- South Savo Social- and Healthcare District, Mikkeli Central Hospital, Mikkeli, Finland
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11
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Utility of P-SEP, sTREM-1 and suPAR as Novel Sepsis Biomarkers in SARS-CoV-2 Infection. Indian J Clin Biochem 2021; 37:131-138. [PMID: 34642555 PMCID: PMC8494168 DOI: 10.1007/s12291-021-01008-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 09/18/2021] [Indexed: 12/22/2022]
Abstract
The coronavirus disease 2019 is a highly contagious viral infection caused by SARS-CoV-2 virus, member of coronaviridae family. It causes life threatening complications due to complexity and rapid onset course of the disease. Early identification of high-risk patients who require close monitoring and aggressive treatment remains challengeable till date. Novel biomarkers which help to identify high risk patients at the early stage is high priority. Objective of this review to find utility of P-SEP, sTREM-1 and suPAR for diagnosis, risk stratification and prognosis of SARS-CoV-2 infected cases. Soluble receptors like, P-SEP, sTREM-1 and suPAR have been involved in immune regulation in SARS-CoV-2 infection and elevate more in severe cases. A comprehensive research of databases like PubMed, EMBASE, CNKI and Web of Science was performed for relevant studies. A total of nine out of fifteen research literature in initial screening were included for this review. Interestingly all studies have reported high levels of P-SEP, sTREM-1 and suPAR in SARS-CoV-2 infected cases and the biomarkers positively correlated with severity of infection. This implies that P-SEP, sTREM-1 and suPAR can be implemented as surrogate marker in blood profile for early diagnosis, risk stratification and prognosis in SARS-CoV-2 for better management in Indian population at the current situation.
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Stauning MA, Altintas I, Kallemose T, Eugen-Olsen J, Lindstrøm MB, Rasmussen LJH, Gamst-Jensen H, Nehlin JO, Andersen O, Tingleff J. Soluble Urokinase Plasminogen Activator Receptor as a Decision Marker for Early Discharge of Patients with COVID-19 Symptoms in the Emergency Department. J Emerg Med 2021; 61:298-313. [PMID: 34092446 PMCID: PMC7997406 DOI: 10.1016/j.jemermed.2021.03.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 02/15/2021] [Accepted: 03/17/2021] [Indexed: 12/25/2022]
Abstract
BACKGROUND Severe acute respiratory syndrome coronavirus 2 (The Covid-19 pandemic) strains health care capacity. Better risk stratification, with discharge of patients with a predicted mild disease trajectory, can ease this burden. Elevated blood-soluble urokinase plasminogen activator receptor (suPAR) has previously been shown to be associated with risk of intubation in confirmed COVID-19 patients. OBJECTIVE To evaluate whether point-of-care measures of suPAR in patients presenting to the emergency department (ED) with symptoms of COVID-19 can identify patients that can be safely discharged. METHODS Observational cohort study including all patients in the ED with symptoms of COVID-19 from March 19 to April 3, 2020. SuPAR was measured at first presentation. Review of electronic patient records 14 days after admission was used to assess disease trajectory. Primary endpoints were mild, moderate, severe, or very severe trajectory. The predictive value of suPAR, National Early Warning Score (NEWS), C-reactive protein (CRP), and duration of symptoms was calculated using receiver operating characteristics (ROC). RESULTS Of 386 patients, 171 (44%) had a mild disease trajectory, 79 (20%) a moderate, 63 (16%) a severe, and 73 (19%) a very severe disease trajectory. Low suPAR was a strong marker of mild disease trajectory. Results suggest a cut-off for discharge for suPAR < 2.0 ng/mL if suPAR is used as a single parameter, and <3.0 ng/mL when combined with NEWS ≤ 4 and CRP < 10 mg/L. CONCLUSION suPAR is a potential biomarker for triage and safe early discharge of patients with COVID-19 symptoms in the ED. suPAR can be used even before SARS-CoV-2 status is known.
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Affiliation(s)
- Marius Ahm Stauning
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Izzet Altintas
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark; Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Thomas Kallemose
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Jesper Eugen-Olsen
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Mette Bendtz Lindstrøm
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Line Jee Hartmann Rasmussen
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark; Department of Psychology and Neuroscience, Duke University, Durham, North Carolina
| | - Hejdi Gamst-Jensen
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark; Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Jan O Nehlin
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Ove Andersen
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark; Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark; Department of Clinical Medicine, Copenhagen University, Copenhagen, Denmark
| | - Jens Tingleff
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
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Altintas I, Eugen-Olsen J, Seppälä S, Tingleff J, Stauning MA, El Caidi NO, Elmajdoubi S, Gamst-Jensen H, Lindstrøm MB, Rasmussen LJH, Kristiansen KT, Rasmussen C, Nehlin JO, Kallemose T, Hyppölä H, Andersen O. suPAR Cut-Offs for Risk Stratification in Patients With Symptoms of COVID-19. Biomark Insights 2021; 16:11772719211034685. [PMID: 34421295 PMCID: PMC8371731 DOI: 10.1177/11772719211034685] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/02/2021] [Indexed: 01/14/2023] Open
Abstract
Objectives Elevated soluble urokinase Plasminogen Activator Receptor (suPAR) is a biomarker associated with adverse outcomes. We aimed to investigate the associations between plasma suPAR levels (testing the cut-offs ⩽4, 4-6, and ⩾6 ng/mL) with risk of 14-day mortality, and with the risk of mechanical ventilation in patients that tested positive for SARS-CoV-2. Methods Observational cohort study of patients presenting with symptoms of COVID-19 at Department of Emergency Medicine, Amager and Hvidovre Hospital, Denmark from March 19th, 2020 to April 3rd, 2020. Plasma suPAR was measured using suPARnostic technologies. Patients were followed for development of mechanical ventilation and mortality for 14 days. Validation of our findings were carried out in a similar sized COVID-19 patient cohort from Mikkeli Central Hospital, Finland. Results Among 386 patients with symptoms of COVID-19, the median (interquartile range) age was 64 years (46-77), 57% were women, median suPAR was 4.0 ng/mL (2.7-5.9). In total, 35 patients (9.1%) died during the 14 days follow-up. Patients with suPAR ⩽4 ng/mL (N = 196; 50.8%) had a low risk of mortality (N = 2; 1.0%; negative predictive value of 99.0%, specificity 55.3%, sensitivity 95.2%, positive predictive value 17.4%). Among patients with suPAR ⩾6 ng/mL (N = 92; 23.8%), 16 died (17.4%). About 99 patients (25.6%) tested positive for SARS CoV-2 and of those 12 (12.1%) developed need for mechanical ventilation. None of the SARS-CoV-2 positive patients with suPAR ⩽4 ng/mL (N = 28; 38.8%) needed mechanical ventilation or died. The Mikkeli Central Hospital validation cohort confirmed our findings concerning suPAR cut-offs for risk of development of mechanical ventilation and mortality. Conclusions Patients with symptoms of COVID-19 and suPAR ⩽4 or ⩾6 ng/mL had low or high risk, respectively, concerning the need for mechanical ventilation or mortality. We suggest cut-offs for identification of risk groups in patients presenting to the ED with symptoms of or confirmed COVID-19.
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Affiliation(s)
- Izzet Altintas
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark.,Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Jesper Eugen-Olsen
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Santeri Seppälä
- Emergency Department, Mikkeli Central Hospital, Mikkeli, Finland
| | - Jens Tingleff
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Marius Ahm Stauning
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Nora Olsen El Caidi
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Sanaá Elmajdoubi
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Hejdi Gamst-Jensen
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark.,Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Mette B Lindstrøm
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Line Jee Hartmann Rasmussen
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark.,Department of Psychology and Neuroscience, Duke University, Durham, NC, USA
| | - Klaus Tjelle Kristiansen
- Department of Anesthesiology Intensive Care Unit, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Christian Rasmussen
- Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Jan O Nehlin
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Thomas Kallemose
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark
| | - Harri Hyppölä
- Emergency Department, Mikkeli Central Hospital, Mikkeli, Finland
| | - Ove Andersen
- Department of Clinical Research, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark.,Department of Emergency Medicine, Copenhagen University Hospital Amager and Hvidovre, Hvidovre, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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14
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Bengaard AK, Iversen E, Kallemose T, Juul-Larsen HG, Rasmussen LJH, Dalhoff KP, Andersen O, Eugen-Olsen J, Houlind MB. Using soluble urokinase plasminogen activator receptor to stratify patients for medication review in the emergency department. Br J Clin Pharmacol 2021; 88:1679-1690. [PMID: 34242432 DOI: 10.1111/bcp.14982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/25/2021] [Accepted: 06/27/2021] [Indexed: 11/30/2022] Open
Abstract
AIMS To investigate whether the association between levels of medication use (including polypharmacy and potentially inappropriate medications [PIMs]) and health outcomes such as readmission and mortality is dependent on baseline soluble urokinase plasminogen activator receptor (suPAR). METHODS This registry-based cohort study included medical patients admitted to the emergency department at Copenhagen University Hospital Hvidovre, Denmark. Patients were grouped according to their admission suPAR levels: low (0-3 ng/mL), intermediate (3-6 ng/mL), or high (>6 ng/mL). Hyper-polypharmacy was defined as ≥10 prescribed medications. PIMs were identified based on the EU(7)-PIM list, and data on admissions and mortality were obtained from national registries. Risk of 90-day readmission and mortality was assessed by Cox regression analysis adjusted for sex, age and Charlson comorbidity index. Results were reported as hazard ratios within 90 days of index discharge. RESULTS In total, 26 291 patients (median age 57.3 y; 52.7% female) were included. Risk of 90-day readmission and mortality increased significantly for patients with higher suPAR or higher number of medications. Among patients with low suPAR, patients with ≥10 prescribed medications had a hazard ratio of 2.41 (95% confidence interval = 2.09-2.78) for 90-day readmission and 8.46 (95% confidence interval = 2.53-28.28) for 90-day mortality compared to patients with 0 medications. Patients with high suPAR generally had high risk of readmission and mortality, and the impact of medication use was less pronounced in this group. Similar, but weaker, association patterns were observed between suPAR and PIMs. CONCLUSION The association between levels of medication use and health outcomes is dependent on baseline suPAR.
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Affiliation(s)
- Anne Kathrine Bengaard
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.,The Capital Region Pharmacy, Herlev, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Esben Iversen
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.,Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Thomas Kallemose
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
| | - Helle Gybel Juul-Larsen
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
| | - Line Jee Hartmann Rasmussen
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.,Department of Psychology and Neuroscience, Duke University, Durham, North Carolina, USA
| | - Kim Peder Dalhoff
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Pharmacology, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Ove Andersen
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,Emergency Department, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
| | - Jesper Eugen-Olsen
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
| | - Morten Baltzer Houlind
- Department of Clinical Research, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.,The Capital Region Pharmacy, Herlev, Denmark.,Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
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15
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Prognostic Role of Soluble Urokinase Plasminogen Activator Receptor at the Emergency Department: A Position Paper by the Hellenic Sepsis Study Group. Infect Dis Ther 2020; 9:407-416. [PMID: 32399855 PMCID: PMC7217599 DOI: 10.1007/s40121-020-00301-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Indexed: 12/11/2022] Open
Abstract
In light of the accumulating evidence on the negative predictive value of soluble urokinase plasminogen activator receptor (suPAR), a group of experts from the fields of intensive care medicine, emergency medicine, internal medicine and infectious diseases frame a position statement on the role of suPAR in the screening of patients admitted to the emergency department. The statement is framed taking into consideration existing publications and our own research experience. The main content of this statement is that sUPAR is a non-specific marker associated with a high negative predictive value for unfavourable outcomes; levels < 4 ng/ml indicate that it is safe to discharge the patient, whereas levels > 6 ng/ml are an alarming sign of risk for unfavourable outcomes. However, the suPAR levels should always be interpreted in light of the patient's history.
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Rovina N, Akinosoglou K, Eugen-Olsen J, Hayek S, Reiser J, Giamarellos-Bourboulis EJ. Soluble urokinase plasminogen activator receptor (suPAR) as an early predictor of severe respiratory failure in patients with COVID-19 pneumonia. Crit Care 2020; 24:187. [PMID: 32354367 PMCID: PMC7191969 DOI: 10.1186/s13054-020-02897-4] [Citation(s) in RCA: 116] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 04/14/2020] [Indexed: 01/31/2023] Open
Affiliation(s)
- Nikoletta Rovina
- 1st Department of Pulmonary Medicine and Intensive Care Unit, National and Kapodistrian University of Athens, Medical School, 115 27 Athens, Greece
| | - Karolina Akinosoglou
- Department of Internal Medicine, University of Patras, Medical School, 265 04 Rio, Greece
| | - Jesper Eugen-Olsen
- Clinical Research Centre, Copenhagen University Hospital, Hvidovre, Denmark
| | - Salim Hayek
- Department of Medicine, University of Michigan, Ann Arbor, MI 48103 USA
| | - Jochen Reiser
- Department of Medicine, Rush University Medical Center, 1717 West Congress Parkway, Chicago, IL 60612 USA
| | - Evangelos J. Giamarellos-Bourboulis
- 4th Department of Internal Medicine, National and Kapodistrian University of Athens, Medical School, 124 62 Athens, Greece
- 4th Department of Internal Medicine, ATTIKON University Hospital, 1 Rimini Street, 12462 Athens, Greece
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Skovsted TA, Petersen ERB, Fruekilde MB, Pedersen AK, Pielak T, Eugen-Olsen J. Validation of suPAR turbidimetric assay on Cobas® (c502 and c702) and comparison to suPAR ELISA. Scandinavian Journal of Clinical and Laboratory Investigation 2020; 80:327-335. [PMID: 32186407 DOI: 10.1080/00365513.2020.1741674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
suPAR is a plasma marker of chronic inflammation, and an elevated suPAR is consistently associated with worse outcome in a variety of clinical conditions. Quantification of suPAR is useful for determining patient risk in triage, but there is no fast automatized method for quick determination of suPAR. We developed and validated a rapid latex particle-enhanced turbidimetric immunoassay for quantification of plasma suPAR on the c502 and the c702 Roche Cobas® 8000 measurment systems. The turbidimetric assay was validated against the suPARnostic® ELISA (ViroGates, Denmark). This validation demonstrates suPAR can be analysed by turbidimetry giving very similar results (<15% difference) compared to the ELISA method and the observed correlations (n = 103) were strong, r > 0.95. Roche Cobas® 8000 instruments demonstrated repeatability and repoducibility, CV % at 3.4-4.1 and 5.7-11.4, respectively. The estimated limit of detection was 1.30 µg/L and 1.31 µg/L for the Cobas® c502 and c702, respectively. Dilution tests showed linearity of suPAR from 1.8 to 26.5 μg/L. The acceptable concentrations of Bilirubin, Intralipid and Hemoglobin, were 350 µmol/L, 3.3 g/L and 1.4 g/L, respectively. suPAR can be quantified reproducibly within 10 min using a turbidimetry assay. This assay is faster than ELISA with similar results, making it suitable for clinical routine analysis.
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Affiliation(s)
- Thor A Skovsted
- Department of Biochemistry and Immunology, Hospital of Southern Jutland, Region of Southern Denmark, Aabenraa, Denmark
| | - Eva Rabing Brix Petersen
- Department of Biochemistry and Immunology, Hospital of Southern Jutland, Region of Southern Denmark, Aabenraa, Denmark
| | - Maj-Britt Fruekilde
- Department of Biochemistry and Immunology, Hospital of Southern Jutland, Region of Southern Denmark, Aabenraa, Denmark
| | | | - Tomasz Pielak
- ViroGates A/S, Birkerød, Denmark.,NUTOPI Sp. z o. o, Poznan, Poland
| | - Jesper Eugen-Olsen
- ViroGates A/S, Birkerød, Denmark.,Clinical Research Center, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
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