Gynaecology & Obstetrics Minimum level of HCG detected by radio immunoassay is : A 1.5-3.5 IU/m1 B 0.5-1 IU/m1 C 0.02-0.05 1U/m1 D 0.001 IU/m1 💡 Explanation Minimum level of HCG detected by radio immunoassay is : ✓ Correct Answer: D. 0.001 IU/m1