The authors found that in the study population, incidence of fetal abnormality was 1.9% (995/52400), including 674 (67.7%) that had been diagnosed previously during the first and/or second trimester, 247 (24.8%) that were detected for the first time at 35 to 37 weeks and 74 (7.4%) that were detected for the first time postnatally. The majority of women in the study were white (74.9%) and the racial origin of the rest of the participants was black (15.4%), South Asian (3.8%), East Asian (2.0%) and mixed (2.9%). Results At the time of third-trimester scan, median maternal age was 31.7 years (interquartile range, 27.5–35.4), median weight was 79.0 kg (interquartile range, 70.8 – 90.0), and median body mass index was 29.1 kg/m 2 (IQR, 26.2 – 33.0). ![]() ![]() Type and incidence of new abnormalities were also determined. The authors classified abnormalities according to the affected major organ system. The research included 52,400 singleton pregnancies all of which had a previous scan at 18 to 24 weeks while 47,214 also had a scan at 11 to 13 weeks. The ultrasound examinations were performed transabdominally, using a 3-7.5 MHz curvilinear transducer, but in 2% to 3% of cases in which there were technical difficulties in obtaining adequate views, a transvaginal scan (3-9 MHz) was also carried out. ![]() The prospective study included women attending for a routine hospital visit at 35+0 to 36+6 week’s gestation at one of two British hospitals between March 2014 and March 2019. The study, which involved more than 50,000 pregnancies, summarized which anomalies could be diagnosed for the first time at ultrasound examination at 35 to 37 weeks’ gestation. Ultrasound examination at 35 to 37 weeks may reveal fetal anomalies that could not be observed in earlier ultrasounds, according to research recently published in Ultrasound in Obstetrics & Gynecology.
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