FETAL NUCHAL THICKNESS MEASUREMENT

Fetal nuchal thickness (NT) refers to the thickness of the part that appears dark in the back of the baby's neck on ultrasonography. It is applied to pregnant women between 11 weeks 1 day and 13 weeks 6 days.
There is a relationship between increased fetal nuchal thickness and some chromosomal anomalies, especially Down syndrome.
A neck thickness of more than 3 millimeters is considered an increased fetal nape thickness.
Conditions with increased fetal nuchal thickness: Chromosomal disorders: trisomy 13, trisomy 18, trisomy 21 (down syndrome), Turner syndrome (45, X0) Fetal nuchal thickness does not increase only in chromosomal anomalies. Other conditions that increase: Heart anomalies Lung anomalies (diaphragm hernia) Kidney anomalies Abdominal wall anomalies (omphalocele, gastroschisis) Some genetic diseases (Arthrogryposis, Noonan syndrome, Smith-Lemli-Opitz syndrome, Stickler syndrome, Jarcho-Levin syndrome and some skeletal anomalies Fetal In cases where the nuchal thickness increases, the risk of heart anomalies is increased, so fetuses with increased nuchal thickness must be evaluated by echocardiography.
The greater the NT thickness, the greater the risk of an anomaly in the fetus. Normal values ​​of NT were determined according to each gestational week. According to these values, the risk is determined according to the percentage increase. Fetuses with NT thickness between 90-95% percentile according to gestational week have a chance of being anomaly more than 90%. The risk of anomaly is very high in cases with NT above 99% percentile. In these cases, it is possible to evaluate whether there is a chromosomal anomaly in the fetus with CVS and possible anomalies in the fetus are scanned with detailed ultrasound examination. It is important to re-evaluate fetuses with increased NT in this NT between 14-16 weeks. This is a good indicator if the nape edema decreases and goes down to normal limits during these weeks, indicating that the risk of an anomaly in the baby is low. If the nuchal thickness does not decrease in the re-evaluation made between 14-16 weeks, it is likely that there is a genetic anomaly or infection in this fetus.


- GLUCOSE SCREENİNG TEST
- AMNIUM FLUID MEASUREMENT
- AMINOSYNTHESIS
- CORDOCENTESİS
- CHORİONİC VİLLUS SAMPLİNG (CVS)
- NST (NONSTRES TEST)

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