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Intrinsic pathway coagulation factor profile, aPTT, partial thromboplastin time, PTT, blood coagulation tests. The aPTT is one of several blood coagulation tests. It measures how long it takes your blood to form a clot. Normally, when one of your blood vessels is damaged, proteins in your blood called clotting factors come together in a certain order to form blood clots and quickly stop bleeding. The aPTT test can be used to look at how well those clotting factors are working.
To test your bodyâs blood clotting abilities, your doctor will collect a sample of your blood in a vial and add chemicals. The test measures how many seconds it takes for your blood to clot after the addition of the chemicals. This test is sometimes known as an activated partial thromboplastin time (APTT) test. Your doctor may order a PTT test to investigate the cause of prolonged or excessive bleeding. Symptoms that may prompt your doctor to order this test include: 1  frequent or heavy nosebleeds.  heavy or prolonged menstrual periods.