Objectives: To estimate and compare the spent time and the intra/inter-observer reliability and agreement from methods of measuring fetal head and trunk volume (FV) between 11w0d and 13w6d. Methods: 2 observers measured FV from fetuses with crownrump length (CRL) = 45–84 mm. FV was measured using 30◦ step rotation evaluating unmodified multiplanar view (UMV = just placing the fetal chest on the central point) delineating the fetus in any plane, and standardized multiplanar view (SMV = fetal sagittal plane should in A plan, head to the left, back lying down, with the central point just below fetal heart) delineating the fetus in both A (SMV-A = fetus rotated over its small axis) and C plane (SMV-C = fetus rotated over its long axis). We also evaluate whether reducing step rotation using 15◦ and 9◦ could improve reliability/agreement using only the method with the best results in the first part of the study. We used Kolmogorov-Smirnov; repeated measures ANOVA to assess systematic errors and time spent; intraclass correlation coefficient (ICC) to assess reliability; and limits of agreement (LoA) width to assess agreement. Results: 40 fetuses were examined. No systematic errors were observed. Reliability and agreement were better for SMV-C. Reducing step rotation didn’t improve the results (table 1). Less time was spent using UMV and larger rotation steps. Conclusions: SMV-C using 30◦ was the best method to assess FV.