Down Syndrome Screening in Pregnancy Explained
Down syndrome screening is one of the most discussed topics in early pregnancy. The NHS offers screening to every pregnant woman, and private options are also available. This guide explains what Down syndrome is, the screening tests on offer, and how to make a decision that is right for you.
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What Is Down Syndrome?
Down syndrome, also called trisomy 21, is a genetic condition that occurs when a baby has an extra copy of chromosome 21. It is the most common chromosomal condition, affecting around one in every 1,000 babies born in the UK. People with Down syndrome have varying degrees of learning disability and may have certain health conditions, but many live fulfilling lives with the right support. The chance of having a baby with Down syndrome increases with the mother's age, though most babies with the condition are born to younger women simply because more younger women have babies.NHS Screening Options
The NHS offers the combined screening test between 11 and 14 weeks, which uses a blood test and nuchal translucency ultrasound measurement to estimate your chance. If you miss this window, the quadruple test is offered between 15 and 20 weeks using a blood test alone. Both tests give a probability rather than a diagnosis and are offered free of charge.Private NIPT Testing
Non-invasive prenatal testing (NIPT) analyses fragments of your baby's DNA in your blood. It is more accurate than the combined test, detecting around 99% of Down syndrome pregnancies, with a very low false-positive rate. NIPT is available privately from around 10 weeks and costs between 300 and 500 pounds depending on the provider. On the NHS, NIPT is offered to women who receive a higher-risk result from combined screening.Making Your Decision
Some women want all the information available; others prefer not to screen at all. Both choices are valid. Screening can help you prepare for a baby with additional needs or decide whether to have diagnostic testing, but it cannot tell you what your baby's life will be like. Take time to read the information your midwife gives you, talk to your partner, and ask questions before deciding.FAQ
### Does a higher risk result mean my baby has Down syndrome?No. It means the chance is higher than the cutoff (usually 1 in 150). Most women with a higher risk result do not have a baby with Down syndrome. Only a diagnostic test such as CVS or amniocentesis can confirm.
Can screening detect other conditions?
Yes. The combined and quadruple tests also screen for Edwards syndrome and Patau syndrome. NIPT can screen for a range of chromosomal conditions, depending on the panel.
This article is for informational purposes only and does not constitute medical advice.
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