The double test is now obsolete as a screening tool in the UK.
The recommended method of screening for Down's syndrome is using the Combined Test.
Combined screening can be carried out in the first trimester and up to 14 weeks and 1 day of pregnancy.
Women who present too late for combined screening should be offered quadruple testing in the second trimester of pregnancy.
For more information: NHS Fetal Anomaly Screening Programme (NHS FASP) www.fetalanomaly.screening.nhs.uk
References:
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