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Summary

The use of an automated method of urinary oestriol determination in pregnancy has enabled an assessment of the value of such estimations in predicting the presence of dysmaturity. Single oestriol measurements early in the third trimester are shown to be of little value in the detection of dysmaturity. The presence or absence of a rising trend in oestriol results is a more reliable index of the occurrence of dysmaturity. For any given urinary oestriol excretion within the period considered the probability of dysmaturity is shown.