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Partial Thromboplastin Time (PTT)

Partial Thromboplastin Time
Also known as:Activated Partial Thromboplastin Time; aPTT; APTT
Formal name:Partial Thromboplastin Time
Related tests:Prothrombin Time (PT); Fibrinogen; Thrombin Time; Lupus Anticoagulant; Activated Clotting Time (ACT); Coagulation Factors; Platelet Count; Heparin Anti-Xa; von Willebrand Factor; Antiphospholipid Antibodies; Dilute Russell Viper Venom Time (DRVVT)

Why should I do it?
As part of an investigation of a possible bleeding disorder or thrombotic episode; to monitor unfractionated (standard) heparin anticoagulant therapy

When should I do it?
When you have unexplained bleeding or blood clotting; when you are on unfractionated (standard) heparin anticoagulant therapy; sometimes as part of a pre-surgical screen

What Kind of Sample is Needed?
A blood sample drawn by needle from a vein in the arm

Test Preparation Needed?
None