Description
Radiology
Sample Required:
No sample is required for an NT (Nuchal Translucency) scan. It is a non-invasive ultrasound examination.
Test Time:
The NT scan typically takes around 20 to 30 minutes to complete.
Test Normal Range:
The normal range for the Nuchal Translucency measurement is generally less than 3 millimeters (mm) for fetuses between 11 and 14 weeks of gestation. However, it’s important to note that the NT measurement alone does not provide a definitive diagnosis for chromosomal abnormalities.
What is the Test?
The NT scan is a specialized ultrasound screening test performed during early pregnancy to assess the Nuchal Translucency, which is the fluid-filled space at the back of the baby’s neck. This measurement, combined with maternal age and blood test results, helps assess the risk of chromosomal abnormalities, particularly Down syndrome (trisomy 21) and some other genetic conditions.
Test Procedure:
During the NT scan, the pregnant person lies on an examination table, and a gel is applied to the abdomen. The ultrasound technician or radiologist then uses a transducer to capture images of the fetus. The Nuchal Translucency measurement is taken by identifying the fluid-filled space at the back of the baby’s neck on the ultrasound image.
When to Take the Test:
The NT scan is usually performed between 11 and 14 weeks of gestation, ideally around 12 weeks.
Who Should Take This Test?
The NT scan is offered as a routine screening test to all pregnant individuals, regardless of age, to assess the risk of chromosomal abnormalities in the fetus.
Precautions for Exceptional Cases (Pregnancy etc.):
The NT scan is generally safe for both the pregnant individual and the fetus. However, it’s essential to have the ultrasound performed by a trained healthcare professional.
FAQs:
Q1: Does the NT scan provide a definitive diagnosis for chromosomal abnormalities?
A: No, the NT scan provides a risk assessment based on the Nuchal Translucency measurement, maternal age, and blood test results. For a definitive diagnosis, further diagnostic tests like chorionic villus sampling (CVS) or amniocentesis may be recommended.
Q2: Can the NT scan detect all chromosomal abnormalities?
A: No, the NT scan is primarily effective in screening for Down syndrome (trisomy 21) and some other genetic conditions, but it cannot detect all chromosomal abnormalities.
Q3: Is the NT scan mandatory during pregnancy?
A: The NT scan is optional, and it’s up to the pregnant individual to decide whether they want to undergo this screening test.
Q4: Are there any risks or side effects associated with the NT scan?
The NT scan is a non-invasive procedure and generally safe. There are no known risks or side effects for the pregnant person or the baby.
Q5: Can the NT scan determine the gender of the baby?
A: The primary purpose of the NT scan is to screen for chromosomal abnormalities, and its main focus is not determining the baby’s gender. However, in some cases, the sonographer may be able to identify the baby’s gender during the scan.
