How should the prenatal examination be performed? In the 12th week and 4th day of pregnancy, I had a transvaginal ultrasound and, unfortunately, the NT measured was about 4 mm. In the 13th week I went back to another doctor for a consultation. The doctor did an abdominal ultrasound and the largest measurement that came out was 3.4 mm, and sometimes it was 2.4 mm. Can different ultrasound sites give different measurements?
NT measurements are made between weeks 11 and 14 of pregnancy. During an ultrasound examination, NT is measured more than once, and ultimately the highest NT value obtained during the course of the examination is taken into account.
There are a number of conditions that must be met forprenetal testingto be credible, including:
- the fetus must be large enough,
- the head should be in the right position in relation to the spine, i.e. it cannot be bent or bent.
If abnormalities are suspected in the fetus, additional, detailed ultrasound examinations are of course also performed later in pregnancy, which assess, for example, the structure of the cardiovascular system or the central nervous system.
It is up to the specialist gynecologist whether he performs the examinationultrasound with a probe through the vagina or through the abdominal wall .
Remember that our expert's answer is informative and will not replace a visit to the doctor.
Krystyna SpodarKrystyna Spodar - specialist in the field of clinical genetics at NZOZ Genomed, ul. Ponczowa 12, 02-971 Warsaw, www.nzoz.genomed.pl, e-mail: [email protected]
The expert answers questions about genetic diseases and congenital malformations, inheritance, and prenatal diagnosis.
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