Forty-two ‘at risk’ pregnancies were serially monitored by sonar biparietal cephalometry, 24 h urinary oestriol assays and determination of serum human placental lactogen. The results were assessed by a scoring system, and it was found that a combination of sonar cephalometry and 24 h urinary oestriol assays gave the most reliable prediction of intrauterine growth retardation.
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