Pelvis or abdomen, pregnancy‑related or pregnancy complication, fetal development and anatomy, ultrasound (the current ultrasound) scan of, by any or all approaches, with measurement of all parameters for dating purposes, performed by or on behalf of a medical practitioner who is a Member or a Fellow of the Royal Australian and New Zealand College of Obstetricians and Gynaecologists, if: (a) the dating of the pregnancy (as confirmed by the current ultrasound) is 17 to 22 weeks of gestation; and (b) further examination is clinically indicated after performance, in the same pregnancy, of a scan mentioned in item 55706 or 55709; and (c) the current ultrasound is not performed on the same patient within 24 hours of a service mentioned in item 55757 or 55758 (NR)