They’re all calculated together to produce your baby’s potential risk of Down syndrome, trisomy 13, or trisomy 18. ![]() These measurements are combined with your blood results and age-related risk. Your doctor will also assess the development of the nasal bone, which may be another indicator of a trisomy. It’s performed around the same time as your double marker test.Īt that point in pregnancy - late in the first trimester - your healthcare provider can measure the size of the clear area on the back of your baby’s neck. The NT scan allows your healthcare provider to use sound waves to collect a real-time image of your baby. When performed without the double marker test, the NT scan is less effective at detecting potential abnormalities. The information gathered from both tests is what gives the result of a low-, moderate-, or high-risk of abnormalities. It’s all about personal choice and your own health history, so there’s really no right or wrong answers to your questions.įor the most accurate results, the double marker test (blood test) and NT scan (ultrasound) are used together in the first trimester screening.
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