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Summary

The concentration of unconjugated oestriol, of oestriol glucosiduronate and of oestriol sulphate was measured by a radioimmunoassay technique in the plasma of five normal primigravidae before and during labour. The only consistent changes in the concentration of any of oestriol fractions was a tendency for the concentration of unconjugated oestriol to rise to a peak immediately before the onset of labour.