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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.
1 A longer-than-normal PTT or APTT can mean a lack of or low level of one of the blood clotting factors or another substance needed to clot blood.2  This can be caused by bleeding disorders, such as hemophilia or von Willebrand's disease.artial thromboplastin time (PTT) is a blood test that measures the time it takes your blood to clot. The normal values listed here-called a reference range-are just a guide.