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  • Title: Laboratory control of heparin therapy.
    Author: O'Shea MJ, Flute PT, Pannell GM.
    Journal: J Clin Pathol; 1971 Sep; 24(6):542-6. PubMed ID: 5094686.
    Abstract:
    The effect of heparin therapy was followed in 50 patients treated for thrombo-embolic disease. Individual response to a standard dose of 40,000 units of heparin daily showed a considerable variation and the effect was not constant on subsequent days. Five of the 50 patients developed a serious haemorrhage. It is proposed that to ensure the adequacy of treatment detectable levels of heparin should be obtained but because of the high risk of bleeding these levels should not be excessive. The results suggest that control of heparin therapy can be based on the thrombin clotting time. Using this test it is advised that treatment is monitored daily in order to achieve a plasma heparin level of up to 1 mg per 100 ml.
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