APTT

This laboratory investigation evaluates APTT, a measurement related to blood clotting or a specific coagulation factor. It may help clinicians investigate unusual bleeding, assess a suspected clotting disorder, or monitor selected treatments when appropriate. Results can be affected by anticoagulant medicines, clinical conditions, and specimen handling, so the laboratory must receive a properly collected sample. Do not stop or alter prescribed medicines for testing unless the treating clinician directs you to do so.