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Updated: Jul 21, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
Published on: September 9, 2012
Toxicity of blood clotting factors
Abstract:
Pure bovine thrombin was separated from autoprothrombin C, and the lethal intravenous dose for mice weighing 25 g was 0.4 ml of a solution containing 50 units of thrombin per milliliter. Autoprothrombin C was not toxic alone, but with crude cephalin it was fatal. The clotting time of human plasma was only slightly accelerated by autoprothrombin C alone; the clotting time was as short as 5 seconds with a combination of autoprothrombin C and cephalin.
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