MLS (ASCP) Practice Test 12

10 free MLS (ASCP) practice questions in the real exam format, covering the official content areas, with an explanation for every answer.

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Question 1 of 10

Hematology

A 12-year-old with lifelong nosebleeds has a platelet count of 78 ×10³/µL, and many platelets are as large as lymphocytes. Her aggregation results are shown. The ristocetin response does not improve when normal plasma is added, and vWF antigen and activity are normal. Which disorder is MOST likely?

Light transmission platelet aggregation (patient)020406080100012345Time (minutes)Aggregation (%)
ADP Collagen Arachidonic acid Ristocetin (1.2 mg/mL)