<prompt> Ideal time for doing ultrasound in pregnancy to assess fetal organ defect is:8-10 wks10-12 wks12-14 wks16-18 wks  <response>: 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 cases2. 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. 