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Analysis Note

The NIH assay procedure uses 0.2 mL of diluted plasma (1:1 with saline) as a substrate and 0.1 mL of thrombin sample (stabilized in a 1% buffered albumin solution) based on a modification of the method of Biggs. Only clotting times in the range of 15-25 seconds are used for determining thrombin concentrations.

Activity is expressed in NIH units obtained by direct comparison to a NIH Thrombin Reference Standard, Lot K.

Biochem/physiol Actions

Serine protease that selectively cleaves Arg-Gly bonds in fibrinogen to form fibrin and fibrinopeptides A and B.

Other Notes

View more information on thrombin at www.sigma-aldrich.com/enzymeexplorer.

Physical form

Lyophilized from saline sodium citrate buffer, pH 6.5

Unit Definition

Activity is expressed in NIH units obtained by direct comparison to a NIH thrombin reference standard.