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JOURNAL ARTICLE
Fast functional protein C assay using Protac, a novel protein C activator.
Thrombosis Research 1986 August 2
A simple and rapid clotting method for the quantitative determination of protein C (PC) in plasma consists of the conversion of PC into activated PC (APC) by means of Protac, an activator protein isolated from Agkistrodon contortrix contortrix venom, of the subsequent degradation of factors V and VIII in PC immuno-depleted plasma by the generated APC and of the measurement of the prolongation of the activated partial thromboplastin time (APTT) which is proportional to the amount of PC in the sample. In 33 normal individuals a mean PC level of 97.1% of a normal pooled plasma was found. Comparison with an enzyme-immunoassay for PC in 33 patients with liver disease revealed a good correlation (r = 0.986). Patients under warfarin therapy (n = 34) had a mean PC level of 19.8%; a comparison with the immunological assay (mean value = 55.3%) in the same population suggested that the assay did not co-estimate acarboxy forms of PC. The assay proved to be insensitive to heparin concentration lower than 1 U/ml. Due to its simplicity, it should be suitable for diagnostic routine and monitoring of patients with abnormal PC level, even if under anticoagulation.
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