Abstract
D-dimer is a neoantigen formed when thrombin initiates the transformation of fibrinogen to fibrin; it is derived from plasmin digestion of cross-linked fibrin. In human medicine, the usefulness of this analyte in diagnosing disseminated intravascular coagulation (DIC) has been assessed in patients fulfilling the clinical and laboratory requirements for this disorder. In canine medicine, the use of D-dimer is relatively new. Detailed studies are needed to understand the relationship between D-dimer concentration in plasma and DIC status in dogs. We validated a D-dimer immunoturbidimetric assay (Tina-quant [a] D-Dimer, Boehringer Mannheim) in canine citrated plasma samples. Intra-assay and interassay variability (coefficient of variation) was 5.63% and 8.82%, respectively. The assay was linear, using 2 samples with low and high D-dimer concentrations (r=.996 and.998). Accuracy was 102.2% and 95.7% based on a recovery study in which 2 samples were assessed. Reference values for D-dimer were established using 70 healthy dogs that were assessed clinically and evaluated on the basis of a complete laboratory workup. The reference range was set between 0.02 and 0.28 microgram/mL (chi-square test for normal distribution, P>.05).
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