Abstract
During the past few years advances in ultrasound imagery have permitted visualization of certain fetal structures that had previously eluded consistent identification. Until recently, attempts to determine fetal sex with ultrasound were successful in late gestation, but the visualization and accuracy rates in the second trimester were not high enough to warrant the use of this technique.1 , 2 The article by Birnholz3 and the letter from Stephens and Sherman4 in this issue indicate that fetal sex can now be determined throughout mid and late gestation.The benefits of fetal-sex determination in the third trimester are somewhat difficult to assess. Those working . . .

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