Modification of the Acid Elution Technique for Quantitation of Fetal Hemoglobin in Individual Erythrocytes

Abstract
A modification of the acid elution procedure for the demonstration of fetal Hb in red cells using fast green stain is described. This technique not only permits improved visual estimation of the amount of fetal Hb in red cells, but allows for the direct quantitation of fetal Hb content of individual cells, using a scanning and integrating microdensitometer. As an application of this method, the distribution of fetal Hb in populations of red cells of individuals was determined. Distributions were examined in sickle cell anemia patients with different proportions of fetal Hb.