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Sonar BPD and Fetal Age: Definition of the Relationship

A large mixed population of pregnant women was studied by sonography in an attempt to define the relation between sonar biparietal diameter (BPD) and fetal age. In the interval of 20-29 weeks, fetal maturity can be predicted from BPD by linear regression, with a maximal deviation from the mean of 11 days in 95% of the population. The use of regression analysis, however, is not statistically feasible in estimating fetal maturity after 29 weeks. A different method is presented in which third trimester BPD values are used to assign precise probabilities to the estimates of fetal age. This approach transforms the sonar gestational age for this later period into a clinically meaningful parameter. Sonographic study of all highrisk pregnancies is recommended between 20- 25 weeks. Such early evaluation establishes fetal age and permits easier differentiation of dysmaturity if growth retardation occurs in the latter part of pregnancy.