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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.
PT and APTT: The PT, INR, and Activated Partial. Thromboplastin Time (APTT) tests are common coagula-. tion laboratory tests used to assess the clotting ability of. blood. The PT/INR test evaluates the extrinsic and com-. mon pathways of the coagulation cascade, while the APTT. test evaluates the intrinsic and common pathways. Using. both tests examines the integrated function of the coagula-. tion factors. INR: Differences in thromboplastin reagents have caused.