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What does a prothrombin time test look for?

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Your body makes several different clotting factors. A problem with any of them -- if it’s missing, broken, or you don’t have enough -- can affect how long it takes a clot to form, if it forms at all. A prothrombin time test looks at one set of these factors to see how well they’re working. It’s often done along with another test, called the partial thromboplastin time test, which looks at another set of factors. Together, they give your doctor a more complete picture of what happens in your body when a clot forms.

From: What Is a Prothrombin Time Test? WebMD Medical Reference

SOURCES:

KidsHealth: “Blood Test: Prothrombin Time,” “Blood Test: Partial Thromboplastin Time (PTT).”

University of Rochester Medical School: “Prothrombin Time.”

Lab Tests Online: “Prothrombin Time and International Normalized Ratio.”

Mayo Clinic: “Prothrombin Time Test.”

National Hemophilia Foundation: “Von Willebrand Disease.”

Reviewed by Minesh Khatri on May 16, 2019

SOURCES:

KidsHealth: “Blood Test: Prothrombin Time,” “Blood Test: Partial Thromboplastin Time (PTT).”

University of Rochester Medical School: “Prothrombin Time.”

Lab Tests Online: “Prothrombin Time and International Normalized Ratio.”

Mayo Clinic: “Prothrombin Time Test.”

National Hemophilia Foundation: “Von Willebrand Disease.”

Reviewed by Minesh Khatri on May 16, 2019

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