Which statement about PTT is true?

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PTT measures the time to fibrin clot formation after a clot activator is added to plasma (with calcium). This tests the intrinsic and common coagulation pathways, reflecting how long it takes for a fibrin clot to form rather than how platelets plug a wound or how the liver produces enzymes or fibrinogen. So the statement describing the time to clot after activation is the true description of what PTT measures.