Which of the following is the most likely diagnosis for a patient with a normal platelet count, prolonged bleeding time, and no aggregation with any agent except ristocetin?
a. Aspirin ingestion
b. Gray platelet syndrome
c. Vitamin C deficiency
d. Glanzmann thrombasthenia
ANS: D
Patients with Glanzmann thrombasthenia have a normal platelet count, prolonged bleeding time. Their platelets do not aggregate with any agonist except ristocetin.
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