<prompt> Most sensitive test for measuring ss HCG levels for diagnosis of pregnancy is?Serum beta HCG by ELISAUrine pregnancy testImmuno Radiometric assayRadio immuno Assay  <response>: Sensitivity of various tests for detection of Hcg Urine pregnancy test: in 60-70 sensitive to 150 mIU Serum beta hcg by ELISA: in 95 sensitive to 5 mIU Radio immuno assay: in 100 sensitive to 1-2 mIU can detect pregnancy on 7th day of ovulation Immuno Radiometric Assay: in 100 sensitive to 0.5 mIU can detect pregnancy on 7th to 10th day of ovulation 