A patient who is not on heparin and has no history of a factor deficiency has a prolonged partial thromboplastin time (PTT).Select the test that should be performed next.

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The lupus anticoagulant results in a prolonged PTT.It is characterized by lack of correction when the patient plasma is mixed 1:1 with normal platelet-poor plasma and the PTT repeated.None of the other listed findings prolong the PTT.

A Patient Who Is Not on Heparin and Has No