Summary
A method has been presented for the preparation of human prothrombin. The product
is apparently homogenous by chromatographic, ultracentrifugal, electrophoretic and
immunochemical analysis. It contains less than 1 part in 107 of thrombin and has a specific activity of 1560 u/mg dry weight. Problems related
to the variability in specific activity of prothrombin preparations reported in the
literature have been critically reviewed.