ACT
Also written as: ACT — Activated Clotting Time
Activated clotting time, a point-of-care test measuring blood coagulation during cardiac surgery.
Full Definition
Activated clotting time is a rapid bedside test used to monitor the anticoagulation status of patients during cardiac surgery, particularly when heparin is administered for cardiopulmonary bypass. The test measures the time it takes for blood to clot in the presence of an activating agent. Target ACT values are typically 300-400 seconds during bypass, with higher levels required for certain procedures. ACT monitoring is essential for preventing thrombosis while on bypass and ensuring adequate reversal with protamine.
Usage
Usage note: Always capitalize when abbreviated. Do not confuse with other coagulation tests like PT/PTT.
In Context
- "The ACT was 480 seconds prior to initiating cardiopulmonary bypass." — Perfusion record
- "Additional heparin was administered to achieve the target ACT of 400 seconds." — Anesthesia note