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For women presenting beyond 14 weeks 1 day, the quadruple test (maternal serum) window runs from 14 weeks 2 days to 20 weeks 0 days.The fetal anomaly ultrasound scan should be offered at first contact visit or booking visit, to take place between 18 weeks 0 days and 20 weeks 6 days.Commissioners ensure they commission services that offer fetal screening to pregnant women as part of NHS care, in accordance with current UK National Screening Committee programmes.Pregnant women who access antenatal care before 21 weeks are offered an ultrasound scan to screen for various conditions in their unborn baby.

Numerator – the number of women in the denominator offered ultrasound screening for fetal anomalies to take place between 18 weeks 0 days and 20 weeks 6 days.

Combined Nuchal Translucency Screening, also known as a Nuchal or NT Scan, is a combined screening test to detect the probability of your baby having a chromosomal disorder such as Downs Syndrome.

The test combines the results of an ultrasound scan, a blood test and the age of the mother.

Numerator – the number of women in the denominator offered the quadruple screening test for Down's syndrome to take place between 14 weeks 2 days and 20 weeks 0 days.

Denominator – the number of pregnant women booking between 14 weeks 2 days and 20 weeks 0 days.

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