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Normal results vary based on the method and activators used. Normal APTT results are usually between 25-40 seconds; PTT results are between 60-70 seconds.APTT results for a patient on heparin should be 1.5-2.5 times normal values.An APTT longer than 100 seconds indicates spontaneous bleeding.artial thromboplastin time (PTT), a test for detecting coagulation defects of the intrinsic system by adding activated partial thromboplastin to a sample of test plasma and to a control sample of normal plasma. The time required for the formation of a clot in test plasma is compared with that in the normal plasma.
ACTIVATED PARTIAL THROMBOPLASTIN TIME (APTT or PTT): The activated partial thromboplastin time (APTT) measures the integrity of the intrinsic and common pathways of coagulation (factors XII, XI, IX, VIII, X, V, and II).CTIVATED PARTIAL THROMBOPLASTIN TIME (APTT or PTT): The activated partial thromboplastin time (APTT) measures the integrity of the intrinsic and common pathways of coagulation (factors XII, XI, IX, VIII, X, V, and II).