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The sex of the fetus may be discerned by ultrasound as early as 11 weeks' gestation. The accuracy is relatively imprecise when attempted early. [15] [16] [17] After 13 weeks' gestation, a high accuracy of between 99% and 100% is possible if the fetus does not display intersex external characteristics. [18]
A 3D ultrasound of a human fetus aged 20 weeks. 3D ultrasound is a medical ultrasound technique, ... This page was last edited on 24 March 2024, at 21:48 (UTC).
The anomaly scan, also sometimes called the anatomy scan, 20-week ultrasound, or level 2 ultrasound, evaluates anatomic structures of the fetus, placenta, and maternal pelvic organs. This scan is an important and common component of routine prenatal care . [ 1 ]
2 to 4 weeks: 0 to 2 weeks: Miscarriage or none (all or nothing) 50 - 100 [1] 4 to 10 weeks: 2 to 8 weeks: Structural birth defects: 200 [1] Growth restriction: 200 - 250 [1] 10 to 17 weeks: 8 to 15 weeks: Severe intellectual disability: 60 - 310 [1] 18 to 27 weeks: 16 to 25 weeks: Severe intellectual disability (lower risk) 250 - 280 [1]
The fetus is considered full-term between weeks 37 and 40 when it is sufficiently developed for life outside the uterus. [ 14 ] [ 15 ] It may be 48 to 53 cm (19 to 21 in) in length when born. Control of movement is limited at birth, and purposeful voluntary movements continue to develop until puberty .
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It gives an accurate risk profile very early. A second blood screen at 15 to 20 weeks refines the risk more accurately. [13] The cost is higher than an "AFP-quad" screen due to the ultrasound and second blood test, but it is quoted to have a 93% pick up rate as opposed to 88% for the standard AFP/QS.
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