Accuracy rate of ultrasound in revealing fetal gender is 95-99%. Depends greatly on ultrasound skills and experience of medical professional who has performed ultrasound. It can be radiologist,sonologist or sonographer as well.
Best time for accurately revealing gender is 20-30th weeks of gestation.As the genetelias are grow enough.
Both in early gestation around 14-17th weeks of gestation and at term ... There are chances for error.
At 14-17th weeks of gestation, Fetal genetelias are not grow enough to accurately identify on ultrasound.
At term especially in case of oligohydramnios and breech presentation it can be very hard to identify fetal gender.
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