A patient in the intensive care unit has anemia, schistocytes, and thrombocytopenia. The PT and PTT are elevated, and the fibrinogen is low. What test to confirm what diagnosis would be appropriate?
a. D dimer to confirm acute DIC
b. Bone marrow to confirm immune thrombocytopenic purpura
c. Platelet antibody against P1A1 to confirm heparin-induced thrombocytopenia
d. Platelet aggregometry to confirm posttransfusion purpura
ANS: A
In acute DIC, the D dimer is elevated, along with the other laboratory findings listed. None of the other conditions listed have the prolonged PT and PTT, low fibrinogen, and elevated D dimers.
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