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Romanelli P, Paltrinieri S, Bonfanti U, Castaman MG, Monza E, Bertazzolo W. Utility of the Ratio between Lactate Dehydrogenase (LDH) Activity and Total Nucleated Cell Counts in Effusions (LDH/TNCC Ratio) for the Diagnosis of Feline Infectious Peritonitis (FIP). Animals (Basel) 2022; 12:ani12172262. [PMID: 36077981 PMCID: PMC9454717 DOI: 10.3390/ani12172262] [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: 07/19/2022] [Revised: 08/15/2022] [Accepted: 08/26/2022] [Indexed: 11/16/2022] Open
Abstract
Background: We tested the hypothesis that the ratio between lactate dehydrogenase activity (LDH) and total nucleated cell counts (TNCC) in effusions may be useful to diagnose feline infectious peritonitis (FIP). Methods: LDH/TNCC ratio was retrospectively evaluated in 648 effusions grouped based on cytology and physicochemical analysis (step 1), on the probability of FIP estimated by additional tests on fluids (step 2) or on other biological samples (step 3, n = 471). Results of different steps were statistically compared. Receiver Operating Characteristic (ROC) curves were designed to assess whether the ratio identify the samples with FIP “probable/almost confirmed”. The cut-offs with the highest positive likelihood ratio (LR+) or Youden Index (YI) or with equal sensitivity and specificity were determined. Results: A high median LDH/TNCC ratio was found in FIP effusions (step1: 2.01) and with probable or almost confirmed FIP (step 2: 1.99; 2.20 respectively; step 3: 1.26; 2.30 respectively). The optimal cut-offs were 7.54 (LR+ 6.58), 0.62 (IY 0.67, sensitivity: 89.1%; specificity 77.7%), 0.72 (sensitivity and specificity: 79.2%) in step 2 and 2.27 (LR+ 10.39), 0.62 (IY 0.65, sensitivity: 82.1%; specificity 83.0%), 0.54 (sensitivity: 82.1%; specificity 81.9%) in step 3. Conclusions: a high LDH/TNCC ratio support a FIP diagnosis.
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Affiliation(s)
- Pierpaolo Romanelli
- MYLAV Veterinary Laboratory La Vallonea, 20017 Passirana di Rho, Italy
- Correspondence:
| | - Saverio Paltrinieri
- Department of Veterinary Medicine and Animal Sciences, University of Milan, 26900 Lodi, Italy
| | - Ugo Bonfanti
- MYLAV Veterinary Laboratory La Vallonea, 20017 Passirana di Rho, Italy
| | | | - Elisa Monza
- MYLAV Veterinary Laboratory La Vallonea, 20017 Passirana di Rho, Italy
| | - Walter Bertazzolo
- MYLAV Veterinary Laboratory La Vallonea, 20017 Passirana di Rho, Italy
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