Ultrasound screenings to find fetal abnormalities may not be as accurate for women who are overweight or obese or who have diabetes prior to becoming pregnant, a U.S. study of 12,200 ultrasounds found. For obese women, test accuracy dropped by 20% compared to normal-weight women, and for diabetic women, the screen only had a 38% success rate in spotting fetal abnormalities.

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