Estimation of fetal hemoglobin levels in individual red cells via fluorescence image cytometry.

A method for estimating fetal hemoglobin (Hb F) levels in individual red blood cells was developed. Cell smears were prepared using a slide maker to ensure uniform thickness and were then stained with immunofluorescence. An antifading gel was applied to preserve a stable fluorescence. The total fluorescence intensities from the same number of red cells in different slide specimens correlated with their hemolysate Hb F levels, which were determined via column chromatography (R = 0.95). Hb F level in individual cells was estimated from fluorescence intensity and cell area, which were determined via image analysis techniques and the hemolysate Hb F level. Blood from a normal subject, a subject with hereditary persistence of fetal hemoglobin, and from sickle cell patients with varying Hb F levels was analyzed. Our analyses showed a wide distribution of Hb F among cells for the normal subject and a gaussian distribution with a peak at the hemolysate Hb F level for the subject with hereditary persistence of fetal hemoglobin. The Hb F distributions were unique to the patients with sickle cell disease. Because Hb F level in individual sickle cells is crucial to the inhibition of cell sickling, the unique hb F distribution may be important in determining the clinical course of this disease.

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