I need to ask a Dr abt my NT scan

Dear Customer
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What is nuchal translucency?

• Nuchal translucency is a collection of fluid under the skin at the back of your baby's neck.

• The amount of fluid is measured during a nuchal translucency (NT) ultrasound scan:
• between 11 weeks and 14 weeks of pregnancy
• or when your baby measures between 45mm (1.8in) and 84mm (3.3in)

All developing babies have some fluid at the back of their neck. But many babies with Down's syndrome have an increased amount.

How accurate is the nuchal scan?

• The scan on its own picks up about 77 per cent of babies with Down's syndrome.

• Sometimes, a scan can suggest that a baby has a high chance of having Down's syndrome, even though the likelihood is actually low. This is called a false positive.
• Combining an NT scan with a blood test gives a more accurate result. The blood test measures the levels of the hormone, free beta-hCG, and the protein, PAPP-A. Babies with Down's syndrome tend to have high levels of hCG and low levels of PAPP-A.
• When the NT scan is combined with this blood test, the detection rate increases to 90 per cent.
• This is called the combined test.

What is a normal nuchal translucency measurement?

An NT of less than 3.5mm is considered normal when your baby measures between 45mm (1.8in) and 84mm (3.3in).
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