activated clotting time test

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activated clotting time (ACT) test

a blood test primarily used to measure the effect of heparin as an anticoagulant during cardiac angioplasty, hemodialysis, and cardiopulmonary bypass. It can also be used to monitor the dose of protamine sulfate required to reverse the effect of heparin. The test measures the time required for whole blood to clot after the addition of particulate activators.

ac·ti·va·ted clot·ting time test

(akti-vāt-ĕd kloting tīm test)
Diagnostic test that determines coagulation time of blood.