Abstract
Antithrombin-III assays are performed to assess response to heparin therapy and efficacy of antithrombin concentrate therapy and in diagnosing hereditary thrombophilia, deep venous thrombosis, pulmonary embolus, and disseminated intravascular coagulation. Synthetic substrate assays for antithrombin-III are the methods of choice; however, most existing assay systems are semiautomated. A fully automated, antithrombin-III assay using the Kabi Chromogenic Synthetic Substrate S-2238 COATEST on the MULTISTAT III has been developed. This assay was compared with the Dade Protopath fluorometric assay. The correlation (r-sq) between the two assay systems was 0.82. Additionally, a three-way assay comparison was also performed, incorporating a new fluorometric substrate for antithrombin-III. The three-way comparative assays revealed correlation as follows: MULTISTAT III fluorometric assay and the MULTISTAT III/Kabi COATEST assay r-sq = 0.90; MULTISTAT III fluorometric assay and the Dade fluorometric assay r-sq = 0.86; and the MULTISTAT III/Kabi COATEST assay and the Dade Protopath fluorometric assay r-sq = 0.95. These automated assays were extremely cost effective and were a fraction of the cost of performing other types of antithrombin-III assays.
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