Understand Your Test

Activated Partial Thromboplastin Time aPTT APTT

Formal Name


Partial Thromboplastin Time


Why Get Tested?

As part of an investigation of a possible bleeding disorder or blood clot (thrombotic episode); to monitor unfractionated (standard) heparin anticoagulant therapy; as part of screening before surgery or other invasive procedure.

When To Get Tested?

When you have unexplained bleeding, inappropriate blood cloting, or recurrent miscarriages; when you are on standard heparin anticoagulant therapy; sometimes as part of a pre-surgical screen.