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What do prothrombin time test results mean?

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A typical prothrombin time test result is 10 to 14 seconds. Higher than that means your blood is taking longer than normal to clot and may be a sign of many conditions, including:

If you have a lower number, your blood clots faster than normal. This could be from taking supplements or eating foods high in vitamin K.

  • Bleeding or clotting disorder
  • Lack of vitamin K
  • Lack of clotting factors
  • Liver disease

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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