Peer-reviewed veterinary case report
How well two Coombs tests detect immune anemia in dogs
By Overmann, Jed A et al.·Published in Veterinary clinical pathology·2007·Department of Veterinary Population Medicine, United States·View original on PubMed →
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Original publication title: Performance of 2 microtiter canine Coombs' tests.
- Species:
- dog
Plain-English summary
A study evaluated two different Coombs' tests used to diagnose immune-mediated hemolytic anemia (IMHA) in dogs, a condition where the immune system attacks red blood cells. The tests were performed on blood samples from 65 dogs suspected of having IMHA. The University of Minnesota Coombs' test was found to be more sensitive than the VMRD Coombs' test, meaning it was better at correctly identifying dogs with the disease. Additionally, using different dilutions of the testing solution improved the accuracy of the results. This information can help veterinarians diagnose IMHA more effectively and start treatment sooner.
People also search for: dog anemia symptoms · Coombs' test for dogs · immune-mediated hemolytic anemia treatment
Abstract
BACKGROUND: The Coombs' test, which detects immunoglobulin or complement on RBC surfaces, has long been the standard for laboratory confirmation of immune-mediated hemolytic anemia (IMHA), a common cause of hemolytic anemia in the dog. This test, however, suffers from relatively low sensitivity. Optimization of test sensitivity would lead to fewer discrepancies between laboratory results and clinical diagnoses, and in some cases institution of appropriate therapy in a timely manner. OBJECTIVES: The objectives of this study were to 1) characterize the sensitivity and specificity of 2 canine Coombs' tests for the detection of IMHA, 2) document the efficacy of using multiple antisera dilutions beyond what is directed by manufacturers, and 3) evaluate the necessity of monovalent antisera in the test protocol. METHODS: Sixty-five canine whole-blood samples submitted for Coombs' testing were evaluated. Patients were classified as IMHA positive or negative based on a set of predetermined criteria. IMHA classification was compared to Coombs' test results from 2 different Coombs' tests adapted to a microtiter-plate format. One Coombs' test (VMRD Coombs' test) utilized a single polyvalent antiserum (VMRD, Inc, Pullman, WA, USA), while a second Coombs' test (University of Minnesota [U of MN] Coombs' test) used both polyvalent and monovalent antisera. RESULTS: Sensitivity and specificity were 61% and 100% for the VMRD Coombs' test, and 82% and 95% for the U of MN Coombs' test. The use of multiple antisera dilutions resulted in 6 additional Coombs' positive test results. All positive Coombs' test results were positive by polyvalent antisera. CONCLUSIONS: When used in a microtiter-plate format, the U of MN Coombs' test was a more sensitive test for the detection of IMHA in canine patients when compared to the VMRD Coombs' test. The use of multiple antisera dilutions increased test sensitivity. Sensitivity, however, was not increased by the use of monovalent antisera in the Coombs' test protocol.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/17523092/