Thromb Haemost 1966; 15(03/04): 442-450
DOI: 10.1055/s-0038-1649446
Originalarbeiten — Original Articles — Travaux Originaux
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Studies Regarding the Effect of Foreign-Surface Contact on the One-Stage Prothrombin Time Determination[*]

J. N Shanberge
1   Departments of Pathology of Evanston Hospital, Evanston, Illinois, and Northwestern University Medical School, Chicago, Illinois
,
T Matsuoka
1   Departments of Pathology of Evanston Hospital, Evanston, Illinois, and Northwestern University Medical School, Chicago, Illinois
› Author Affiliations
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Publication History

Publication Date:
27 June 2018 (online)

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Summary

The shortening of the one-stage prothrombin time of plasma brought about by increased foreign surface contact is dependent upon “activation” of factor VII. This activation of VII is the result of a series of activations involving factors XII, IX and probably XI as well. In this it is similar to the activation of factor VIII. Although the prothrombin time in an individual with hemophilia B or the Hageman trait is ‘‘normal”, no shortening occurs after increased foreign surface contact. Factor VII deficient plasma with normal levels of factors XII and IX is “activated” by “contact” in proportion to the level of VII present. No increase in activity of factors II, V, or X was observed after increased foreign surface contact.

* Supported by IJSPHS NIH Grant HE-09122 and the Thomas J. Dee and George C. Moody Memorial Research Funds of Evanston Hospital.