A patient is suspected of having HS. However, there appear to be <1% spherocytes on the peripheral blood smear, and the osmotic fragility test is normal. What test could be performed to increase the sensitivity of testing for HS?
a. Incubated osmotic fragility test
b. Immunophenotyping for CD55 and CD59
c. Sucrose hemolysis test
d. Ham test
Correct Answer: A
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