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  • Title: Monitoring heparin therapy with the activated partial thromboplastin time.
    Author: Stuart RK, Michel A.
    Journal: Can Med Assoc J; 1971 Mar 06; 104(5):385-8. PubMed ID: 5557913.
    Abstract:
    Difficulties associated with the whole blood clotting time (W.B.C.T.) as a method of monitoring heparin therapy have led to the investigation of the activated partial thromboplastin time (A.P.T.T.) as an alternative. The conclusion is reached that the latter procedure possesses several advantages. Using the method described and a citrate-preserved blood sample collected just prior to the administration of the next serial dose of heparin, the suggested therapeutic duration of the A.P.T.T. is 70 seconds or twice the mean control value. A practical range for this method is 60 to 70 seconds.
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