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DOI: 10.1055/s-0038-1649844
The International and “NIH” Units for Thrombin - How Do They Compare?
Publikationsverlauf
Received 19. August 1994
Accepted after resubmission 27. April 1995
Publikationsdatum:
09. Juli 2018 (online)
Summary
The current International Standard (IS) for α-thrombin was established in 1991. It was related in unitage with the 1st IS for Thrombin established in 1975 and contains 100 IU of thrombin activity. The National Institute of Health (NIH) standard (Lot J) is in common use for the calibration of commercial thrombin reagents and this study reports on a comparison of the thrombin units defined by these 2 standards. This study has indicated that one “NIH” unit is equivalent to 1.1 to 1.3 IU of thrombin, depending on the influence of PEG in the assay. A unitage ratio figure of 1.15 was recommended following analysis of data obtained in the presence and absence of PEG in the comparative assays. This was confirmed by amidolytic assay data.