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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.
INR and APTT are two types of test conducted to measure the coagulation of blood in the patient. INR stands for âInternational Normalized Ratioâ. It is also called âProTime INRâ and âINR PTâ. APTT, on the other hand, stands for âActivated Partial Thromboplastin Timeâ. The international normalized ratio is derived form the prothrombin time (PT) and the prothrombin ratio (PR). These are used to measure the extrinsic pathway of coagulation.