<prompt> 28 weeks on USG-TVS a G2P1 female was detected as having major placenta pre. A confirm atoy scan should be performed:At 32 weeksAt 34 weeksAt 36 weeksAt onset of labor  <response>: If the earlier scan showed a placenta completely over the internal os it is most likely to persist in later scans.If the 18-20 weeks scan revealed a lowlying placenta or a marginal placenta prae placental localization is best repeated around 32 weeksrefer pgno:130 sheila textbook of obstetrics 2 nd edition 