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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.
Criterion-referenced tests (CRTs) are intended to measure how well a person has learned a specific body of knowledge and skills.Multiple-choice tests most people take to get a driver's license and on-the-road driving tests are both examples of criterion-referenced tests.n contrast, norm-referenced tests (NRTs) are made to compare test takers to each other. On an NRT driving test, test-takers would be compared as to who knew most or least about driving rules or who drove better or worse.