Gynaecology & Obstetrics At what level of b-HCG is it that normal pregnancy can be earliest detected by TVS: A 500 IU/m1 B 1000 IU/m1 C 1500 IU/m1 D 2000 IU/m1 💡 Explanation At what level of b-HCG is it that normal pregnancy can be earliest detected by TVS: ✓ Correct Answer: B. 1000 IU/m1