Hemoglobin A2 (Hb A2) and hemoglobin F (Hb F) are important analytes in the diagnosis and follow up of Hb diseases. We evaluated a new capillary zone electrophoresis (CZE) kit for Hb A2 and Hb F measurements. The imprecision ranged from 3% to 6% for Hb A2 and Hb F at physiological and pathological concentrations. The method compared well with cation-exchange HPLC for Hb A2 and Hb F and with ani...

It has been known for many years that high levels of fetal hemoglobin (Hb F) have an important clinical benefit in patients with sickle cell anemia (SCA). This knowledge was initially based on the observation that populations of Indian and Arabian SCA patients with high Hb F levels have a milder clinical form of the disease.1 Later on, epidemiological studies demonstrated that patients with Hb ...

1. Hb-F(I), with the previously proposed structure alpha(A) (2)gamma(F)gamma(AcF), would be an exception to the general hypothesis that haemoglobins are in mobile equilibrium with their sub-units at all pH values. However, studies presented in this paper suggest that this is not so. 2. Gel-filtration and sedimentation analyses show that Hb-F(I) dissociates at acid pH and gives only the usual ty...

Complete automation of high-performance liquid chromatography (HPLC) for determination of hemoglobin F (%Hb F) and hemoglobin A1c (%Hb A1c) levels has made this procedure available in many clinical laboratories. However, the physiological changes in %Hb F during pregnancy and the effects of physiological and supraphysiological levels of %Hb A1c on measurement of %Hb F have not been studied exte...

A monoclonal antibody (mAb) that recognizes the y chain of human fetal hemoglobin(Hb F) has been produced by cell hybridization techniques. The mAb reacts with Hb F (a2y2), Hb Bail’s(y),and Hb Kenya (yhybrid), butdoes notcrossreactwith Hb A (a) or Hb A2 (a2&). We describe a direct enzyme-linked immunoassay (ELISA)for measurement of Hb F, in which hemoglobins from standards or from unknown hemol...

Recent interest in therapies for sickle cell anemia based on elevating fetal Hb has made accurate estimates of the sparing effect of fetal Hb (Hb F) and other non-sickle Hbs on sickle Hb (Hb S) polymerization essential. We have developed a technique, using HbCO as surrogate for HbO2, that enables us to assess the solubility of Hb S as a function of ligand saturation under conditions that mimic ...

Studies were carried out during the postnatal period in infants born at or before the 32nd wk of gestation to determine the proportion of fetal hemoglobin (Hb F) and adult hemoglobin (Hb A) being synthesized, and to compare these studies to those previously reported on at birth from normal newborn infants 25-43 wk gestation. When the pretern infants reached the postconceptional age correspondin...

Studies were carried out during the 1st yr of life in normal infants born at term to determine the proportions of fetal hemoglobin (Hb F) and adult hemoglobin (Hb A) being synthesized, in order to describe the complete switchover from Hb F to Hb A synthesis during postnatal life. 53 blood samples from 37 infants were incubated in an amino acid mixture containing [14C]leucine and chromatographed...

The authors describe a modification of the instrumental parameters of the Diamat fully automated HPLC system for Hb A(2) assay (Bio-Rad Laboratories, Milan, Italy) in order to obtain simultaneous determination of Hb A(2) and Hb F.Hb A(2) and Hb F measurements are reproducible (within-run CV 2.6%, with Hb A(2)2.7%; 5.1%, with Hb F 1.3%) and accurate (from a comparison with two microchromatograph...