33.3 mg soluble in 1 mL of water gives slightly hazy solution
Activity (Fibrinogen, pH 7.6 at 37°C)
>= 50 NIH-U/mg protein
Unit definition
The amount required to clot 1 ml of standardized fibrinogen solution in 15 seconds. Approximately 2 U.S. units are required to clot 1 ml of oxalated human plasma in the same period of time.