Partial Thromboplastin Time
Alternate Names : PTT, Activated Partial Thromboplastin Time, APTT
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 vitamin K deficiency
Abnormally low values are usually not important. Occasionally they are a sign of widespread cancer.
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