Radiology General 48d71756 USG can detect gestation sac earliest at – A 5–6 weeks of gestation B 7–8 weeks of gestation C 10 weeks of gestation D 12 weeks of gestation High-Yield Explanation The gestational sac can be visualized as early as 41/2 weeks by transvaginal USG and 5 weeks by transabdominal USG.