The distribution of nuchal translucency measurements in singleton pregnancies

Objective

In this study, the evaluation of the mean values in the NT measurements of low-risk Turkish population is aimed. Also, the effect of gestational week, crown-rump length (CRL), parity and maternal weight on NT measurements is evaluated.

Methods

Between March 2013 and June 2014, 351 singleton pregnancies, who admitted to perinatology outpatient clinic for 11-14 week screening, are included in the study. NT, CRL measurements, gestational week, maternal weight, parity characteristics are analysed. 351 subjects are divided into 4 groups according to the CRL measurements: Group I for CRL 45-54 mm (n=62); Group II for CRL 55-64 mm (n=133); Group III for CRL 65-74 mm (n=115) and Group IV for CRL 75-84 mm (n=41). The groups are compared according to maternal age and NT measurements.

Results

The mean maternal age was 28.76 ± 5.51, gestational week was 12.29 ± 0.69, CRL measurements were 63.69 ± 9.07 mm, mean NT values were 1.23 ± 0.48 mm. There was no significant difference regarding the maternal age and NT measurements (p=0.817 and 0.072 respectively). NT values were significantly correlated with CRL (r=0.232; p=0.001) and gestational week (r=0.203; p=0.001). There was no relation between NT and gravida, parity and maternal weight.

Conclusion

First trimester screening has been commonly used in prenatal medicine. NT is a part of first trimester screening. NT measurement must be performed according to the stanrdardised measurement techniques. The management of the results should be organised according to the algorithms.

Keywords

Nuchal translucency, crown rump length, first trimester screening