Abstract
SummaryTotal plasma oestriol in pregnancy was estimated by a competitive protein binding method. The advantages of the measurement of plasma oestriol levels over the 24‐ or 48‐hour urinary oestriol assays are discussed. The pattern of plasma oestriol levels in the third trimester of pregnancy was investigated in over 400 healthy women and in general a uniform increase was found from the 28th week until term. Diurnal variation was found to be present, but this did not preclude the use of the method for assessing the feto‐placental unit. Exercise and meals had a minimal effect on the oestriol levels. Following delivery the level decreased sharply to reach, within four hours, one‐half that found just prior to delivery.
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