Question An asymptomatic patient presents with persistent erythrocytosis Option. The hematologist has ruled out polycythemia vera and other causes Option. What is an additional explanation for the erythrocytosis, and what laboratory assay might be useful in this case? Solve

a Option. an unstable hemoglobin variant identified by performing a Heinz body stain

b Option. a high-affinity hemoglobin variant identified by isoelectric focusing

c Option. a crystalizable hemoglobin variant demonstrated by observing hemoglobin C crystals on a smear

d Option. a quantitative decrease in globin chain production indicated by observing an increased level of HbF