You may have a earlier scan, if you are experiencing pain or bleeding for example or unsure of LMP dates. Transabdominal ultrasound TAU and also the transvaginal ultrasound TVU are valuable diagnostic tools in obstetrics and gynecology. Transabdominal ultrasound will provide a panoramic view of the abdomen and pelvis and is noninvasive, whereas transvaginal ultrasound provides a more limited pelvic view and requires insertion of a probe into the vagina. Transabdominal ultrasound cannot reliably diagnose pregnancies that are less than 6 weeks gestation. Prompt diagnosis made possible by transvaginal ultrasound can, therefore, result in earlier treatment.
Toward the end of your first trimester, your practitioner may recommend one of several prenatal screenings , including nuchal translucency. It helps doctors determine if a baby is statistically more likely to have a chromosomal abnormality. NT focuses on a small, clear space at the back of a growing baby's neck called the nuchal fold. Experts have found that this spot tends to accumulate fluid in babies with chromosomal abnormalities.
Since chromosomal abnormalities can result in impaired cardiovascular development, a nuchal translucency scan is used as a screening, rather than diagnostic, tool for conditions such as Down syndrome , Patau syndrome , Edwards Syndrome , and non-genetic body-stalk anomaly. There are two distinct measurements: the size of the nuchal translucency and the thickness of the nuchal fold. Nuchal translucency size is typically assessed at the end of the first trimester, between 11 weeks 3 days and 13 weeks 6 days of pregnancy. All women, whatever their age, have a small risk of delivering a baby with a physical or cognitive disability.
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