Two types of prothrombin in vitamin K deficiency

H.C. Hemker, Annemarie D. Muller, E.A. Loeliger

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    In vitamin K deficiency (either absolute or induced by oral anticoagulants) two types of prothrombin occur. One is not distinguishable from normal prothrombin. It generates thrombin quickly in a medium in which the factors V, VII and X, thromboplastin and Ca++ are present in sufficient amounts. The other is converted into thrombin much more slowly under the same conditions. In the onestage prothrombin assay only the first form is measured, in a two-stage prothrombin assay both forms are estimated. This accounts for the well-known discrepancy between these two tests in vitamin K deficiency. The abnormal prothrombin can be considered one of the Proteins Induced by Vitamin K Absence. The occurrence of this kind of proteins fits in the concept of the action of vitamin K as a co-factor in a system that converts polypeptide-precursors into coagulation factors.
    Original languageEnglish
    Pages (from-to)633-637
    Number of pages5
    JournalThrombosis et diathesis haemorrhagica
    Issue number3
    Publication statusPublished - 30 Jun 1970


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