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Partial Thromboplastin Time Test

Learn about the Partial Thromboplastin Time Test to assess blood clotting. Understand how it works, its clinical significance, and what to expect.

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By Olivia Sayson on Aug 2, 2025.

Fact Checked by Ericka Pingol.

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Commonly asked questions

They are typically requested by doctors concerned about a patient's bleeding or clotting function. This may include doctors who specialize in hematology, cardiology, and internal medicine.

It helps monitor various conditions, including bleeding disorders like hemophilia and von Willebrand disease, assess liver disease and detect vitamin K deficiency.

A small blood sample is drawn from a vein in the arm to perform a PTT test. The blood sample is then placed in a tube with a particular reagent. The time it takes for the blood to clot is then measured.

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