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Objective To assess the intra-and interobserver reproducibility of ultrasound measurements of fetal biometric parameters. BPD, AC, HC and FL were as follows: 0.996 (0.995, 0.997), α 0.998; 0.994 (0.992, 0.996), α 0.997; 0.996 (0.994, 0.997), α 0.998; and 0.994 (0.992, 0.996), α 0.997, respectively. Similarly, the inter-CC with the 95% CI and RC for the same parameters were as follows: 0.995 (0.993, 0.997), α 0.998; 0.980 (0.971, 0.990), α 0.990; 0.994 (0.992, 0.996), α 0.997; and 0.990 (0.985,0.993) Methods Results Reliable consensus was observed for both the intra-CC and inter-CC and RC for all four biometric parameters. The intra-CC with the 95% CI and RC for the

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A sonographic evaluation of umbilical cord coiling in the second trimester correlates with the true UCI at birth, although the sensitivity in predicting coiling patterns as hypocoiled and hypercoiled cords is less accurate. A difference between the aUCI and matched UCI at birth could be explained by a sonographic error in the sampling of different umbilical cord segments with discordant coiling patterns or the possibility of a dynamically evolving UCI with advancing gestational age.

Fetuses with an isolated single umbilical artery are at similar risk for SGA compared with fetuses with 3-vessel umbilical cords. It appears that antepartum serial ultrasound examination does not provide more information for interval fetal growth assessment in fetuses with an isolated single umbilical artery.

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