NT Scan Explained: What 1 in 1000 Risk Means (Video)

Transcript

What does a 1 in 1000 risk really mean?

What does a 1 in 1000 risk really mean?

NT Scan Basics

We'll break down the NT scan numbers so you know what they really mean and how they guide the next steps in your pregnancy journey.

What the NT scan measures

Every early baby has a tiny fluid pocket under the skin at the back of the neck. On the ultrasound it appears as a thin dark strip between two bright lines, and the sonographer measures its widest part in millimetres.

Reading the report line by line

The report lists the crown-rump length, which sets the gestational age, the fetal heart rate that’s usually fast in the first trimester, the NT measurement in millimetres, the main number you’ll compare to norms, and whether the nasal bone is seen.

Normal NT cutoff

Most labs consider an NT measurement under 3.5 mm to be within the usual range for a healthy pregnancy.

Risk numbers explained

A risk shown as 1 in 1000 means that, on average, one out of a thousand similar pregnancies would have the condition, so it’s a low chance. A 1 in 100 risk is higher, and each lab sets its own cut-off for what counts as low or high.

A higher second number means lower chance: 1 in 1000 is calmer news than 1 in 100.

Next steps if risk higher

If the screen suggests a higher chance, you can choose a cell-free DNA blood test for a more accurate screen, or go straight to diagnostic options like CVS or amniocentesis. Detailed anatomy and heart scans are also offered later, even when chromosomes are normal.

The one key takeaway

A risk of one in a thousand means, on average, only one out of a thousand similar pregnancies will have the condition, so it’s low, not zero, and usually just a screening flag.

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Read the full guide

The full guide is on thecareonline.com. General information only, so check with your doctor for your own case.