[Thrombin Reference Standard (Control 961) of National Institute of Health Sciences].

The "Thrombin Reference Standard (Control 961)" of National Institute of Health Sciences was prepared. The precision of filling into ampoule was about 1% as C.V. The content of a-thrombin was about 87%. The thrombin potency of the standard material was assayed against the Thrombin Reference Standard (Control 8710) according to the method of JP XIII and the potency was 1033 +/- 59 unit/ampoule. From the results, the potency of the proposed material for Thrombin Reference Standard was defined as 1,030 units per ampoule.