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APTT - Partial Thromboplastin Time


Results and Values

What do the test results mean?

The normal range for a PT test depends on the standards of the lab. It generally falls between 25 to 45 seconds. Abnormally high PTT values may occur when a person:

  • is taking blood-thinning medicines, especially heparin
  • is taking other medicines, such as certain antibiotics, that interfere with the test
  • has severe liver disease
  • has disseminated intravascular coagulation (DIC), a complex blood disorder that occurs when clotting mechanisms are activated throughout the body
  • has certain inherited bleeding disorders, such as hemophilia
  • has a phylloquinone, which is found in food\ \menadione, which is man-made\ \menaquinone, which is produced by the body\ ',CAPTION,'Vitamin K');" onmouseout="return nd();">vitamin K deficiency
  • Abnormally low values are usually not important. Occasionally they are a sign of widespread cancer.


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