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Czopowicz M, Szaluś-Jordanow O, Mickiewicz M, Moroz A, Witkowski L, Markowska-Daniel I, Stefaniak T, Bagnicka E, Kaba J. Haptoglobin and serum amyloid A in goats with clinical form of caprine arthritis-encephalitis. Small Rumin Res 2017. [DOI: 10.1016/j.smallrumres.2017.09.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Czopowicz M, Szaluś-Jordanow O, Mickiewicz M, Moroz A, Witkowski L, Markowska-Daniel I, Reczyńska D, Bagnicka E, Kaba J. Agreement between commercial assays for haptoglobin and serum amyloid A in goats. Acta Vet Scand 2017; 59:65. [PMID: 28969647 PMCID: PMC5625724 DOI: 10.1186/s13028-017-0333-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 09/25/2017] [Indexed: 11/10/2022] Open
Abstract
Haptoglobin (Hp) and serum amyloid A (SAA) are considered as the major acute phase proteins (APPs) in goats. These APPs have been investigated in several studies during the last decade. In most studies, a colorimetric assay for Hp and a solid phase sandwich ELISA for SAA have been used for quantification. In 2015, reference intervals for APPs were determined using a new type of assay, the competitive ELISA (cELISA). Results obtained by the cELISA differed significantly from results obtained by previously used assays. The present study aimed to assess the agreement between so far used assays and cELISAs. Sera of 152 female dairy goats of two Polish national breeds were analysed. The concentration of Hp was determined using a colorimetric assay (Hp-CA) and the cELISA (Hp-cELISA), while a solid phase sandwich ELISA (SAA-sELISA) and the cELISA (SAA-cELISA) were used to measure SAA. Agreement between test results was assessed by preparing Bland-Altman plots, and analyzing 95% limits of agreement (LoA). Finally, the assays for Hp and SAA were compared using 147 and 138 serum samples, respectively, as 5 and 14 paired measurements, respectively, were excluded from agreement analyses to avoid extrapolation of Hp and SAA concentration. Measurements obtained by the Hp-CA and Hp-cELISA showed weak positive correlation (r = 0.24, P = 0.003). Limits of agreement (LoA) ranged from + 1.6 (95% CI 1.4 to 1.8) g/L to - 1.5 (95% CI - 1.7 to - 1.3) g/L. Measurements yielded by the SAA-sELISA and SAA-cELISA did not correlate (r = - 0.01, P = 0.855). LoA ranged from + 14.5 mg/L (95% CI 12.9 to 16.1) to - 8.5 mg/L (95% CI - 10.1 to - 6.9). Agreement between the two types of commercial assays for determination of Hp and SAA concentrations in goats is poor and cELISAs tend to underrate both Hp and SAA concentrations.
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Affiliation(s)
- Michał Czopowicz
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Olga Szaluś-Jordanow
- Division of Infectious Diseases, Department of Small Animal Diseases with Clinic, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Marcin Mickiewicz
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Agata Moroz
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Lucjan Witkowski
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Iwona Markowska-Daniel
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
| | - Daria Reczyńska
- Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Postępu 36A, Jastrzębiec, 05-552 Magdalenka, Poland
| | - Emilia Bagnicka
- Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Postępu 36A, Jastrzębiec, 05-552 Magdalenka, Poland
| | - Jarosław Kaba
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776 Warsaw, Poland
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