A Prolonged PTT Is Corrected When Mixed with Normal Plasma

question 20

Multiple Choice

A prolonged PTT is corrected when mixed with normal plasma and tested immediately and after a 2-hour incubation.Which test (or tests) should be performed next?

• A)Bethesda titer
• B)high-phospholipid PTT
• C)anti-Xa assay
• D)factor VIII and IX assays

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