<prompt> True statement regarding ectopic pregnancy:a Pregnancy test positiveb hCG levels should be 1000 mlUml for earliest detection of gestational sac by TVSc hCG levels should be 1000 mlUml for earliest detection of gestational sac by TVSd Methotrexate is usedabdbcdabcab  <response>: Lets see each option separately-Option a-Urine pregnancy test - ELISA is sensitive to 10-50 MIUml and are positive in 95 of ectopic pregnancies.Dutta Obs. 7e, p 182Current serum and urine pregnancy test that use enzyme - linked immunosorbent assays ELISA for -hcG are sensitive of levels of 10 to 20 MIUml and are positive in greater than 99 of ectopic pregnancies.Williams Obs. 23e, p 242,Thus option a is correct.The lowest level of serum hCG at which a gestation sac is consistently visible using TVS discriminatory zone is 1500 IUL. the corresponding value of serum hCG for TAS is 6000 IUL. When the hCG value is greater than 1500 IUL and there is an empty uterine cavity, ectopic pregnancy is more likely.Ref Dutta Obs. 7e, p 183A number of investigation have described discriminatory hCG levels above which failure to visualize a uterine pregnancy indicates with high reliability that pregnancy is not alive or ectopic. Banhart and colleagues 1994 reported that an empty uterus with serum hCG concentration 1500 MIUml was 100 accurate in excluding a live pregnancy.Williams Obs. 23e, p 244Thus option b is correct and option c incorrect. 