Determination of Biparietal Diameter by the Ultrasonic B‐Scan Technique

One thousand four hundred and forty‐eight biparietal measurements were performed on 1 062 un‐selected patients between the 24th‐42nd weeks of gestation. 869 patients had a single measurement and 193 patients had two or more measurements. The B‐scan method was used for the measurements. The fetal age estimated from the biparietal measurement was compared with the calculated maturity based on the last menstrual cycle.