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In order to evaluate the possible underlying factors for the increase in red cell 2,3-diphosphoglycerate content observed in late diabetic pregnancy, its relationship with serum unconjugated oestriol, human placental lactogen, haemoglobin and hydrogen ion concentrations was investigated in 42 pregnant diabetic women. A significant correlation was found between red cell 2,3-diphosphoglycerate and serum unconjugated oestriol (r = 0.54, p less than 0.001), whereas no correlation was present between 2,3-diphosphoglycerate and the following variables: arterial pH, haemoglobin concentration and human placental lactogen. The content of 2,3-diphosphoglycerate correlated significantly with haemoglobin-oxygen affinity expressed as P50 at pH 7.4 (r = 0.34, p less than 0.05). The results of this study indicate that serum unconjugated oestriol may participate in the regulation of red cell 2,3-diphosphoglycerate content and thereby of the maternal blood oxygen release to the fetus.

Correlation of serum unconjugated oestriol to red cell 2,3-diphosphoglycerate levels in diabetic pregnancy