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Objective: We aimed to determine reference ranges and establish nomograms for fetal neck circumference and area in Turkish population. Methods: A total of 696 women with singleton normal pregnancies were included in this prospective study and the fetal neck circumference and area measurements were conducted with the technique defined by Sherer et al. in 2007. Results: The fetal neck circumference and area measurements were highly correlated with the weeks of gestation. The equations obtained for fetal neck circumference (FNC) and fetal neck area (FNA) were FNC= -0.0012WG2 + 0.5312WG 1.9248 (R=0.8403; p<0.01) and FNA= 0.017WG2 – 0.073WG (R=0.8; p<0.01), respectively. Conclusion: This study helped us to establish nomograms of FNC and FNA in Turkish population for the second and third trimesters of gestation. We believe that these measurements could be a significant predictor for the determination of weeks of gestation.

Nomograms of the fetal neck circumference and area