Ideal time for doing ultrasound in pregnancy to assess fetal organ defect is:

Ans: d (16-18 wks) Ref: Dutta, 6th ed, p. 70Routine sonography at 18-20 wks permits a detailed survey of fetal anatomy. Fetal organ anatomy is surveyed to detect any congenital malformations.Routine investigations done during antenatal checkup1. Blood grouping, VDRL, RBS (only in selected cases)2. Urine routine- protein, sugar and pus cells.3. Cervical cytology in selected cases.Special investigations in pregnancy1. Serological tests for rubella, Hep B and HIV (with consent).2. MSAFP or triple test for mothers at risk.3. USG - first trimester scan and anomaly scan at 20 wks.