Summary The results of 201 24‐hour urinary oestriol estimations in 50 twin pregnancies are presented. The 10th, 50th and 90th centiles were approximately 1.7 times higher than those for singleton pregnancies, reflecting the combined weights of the two fetuses. In general, the oestriol values were not low before or after intrauterine death of one fetus or in pregnancies with intrauterine growth retardation. The trends in serial oestriol values were of more relevance in assessing fetal jeopardy than grading the values as normal or low.
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Duff et al. (1974) studied this question.
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