Abstract
To the Editor: With the increased improvement in resolution in digital linear-array real-time ultrasound machines comes marked improvement in identification of specific parts of fetal anatomy at an increasingly earlier stage of gestation. In the few reports of fetal-sex determination by ultrasound, accuracy of the technique has not been important, because determination of female sex has been performed by exclusion and the earliest time for accurate determination of sex was the 26th week of gestation, thus excluding clinical use of this technique for diagnosis of recessive X-linked disorders.In a report of 227 patients examined during and after the 20th . . .

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