A 5-year-old boy has his blood drawn for platelet aggregation studies. Ristocetin aggregation (RIPA) comes back abnormal with all other agonists displaying normal aggregation. VWF antigen is within normal limits.
What is the most likely reason for this discrepancy?
a. The VWF antigen test was performed incorrectly and should be repeated.
b. The patient might be suffering from a qualitative platelet defect disorder.
c. The RIPA exam was performed incorrectly and should be repeated.
d. Multimer analysis should be performed to confirm these findings.
Question 2
Which of the following is used in the identification of a secondary hemostatic pathway anomaly?
a. Bleeding time
b. ACE activity
c. Platelet aggregation studies
d. Factor assays
BLOOD CELLS
Testing for Occult Blood
Common Blood Chemistry Tests
Primary factors affecting blood pressure
Branching airways and blood vessels
The Serial Numbers for Each Day of the Year