Fetal cardiac pulsation can be detected earliest by USG at what age of intrauterine life

Ans: b (7th week) Ref: DC Dutta, Textbook of obstetrics 6th ed, p. 645Fetal structures identified by transabdominal USG and corresponding gestational age* Gestational sac-- 5th week* Fetal pole-- 6th week* Yolk sac-- 6th week* Cardiac pulsation-- 7lh week* Embryonic movements-- 8th weekTrans vaginal USG will detect the above structures one week earlierDoppler can pick up fetal heart by 10 weeks.NOTE- a hcg > 5000-6500 IUL--intrauterine sac is seen in TAS- a hcg> 1000 IUL -- intrauterine sac seen in TVS.In the above question, whether transabdominal / transvaginal route is not mentioned. The fetal cardiac activity is earliest detected at 6th week by transvaginal USG and it is not given in the choice. If 6th week was given in the choice, it should be the answer. Otherwise we can safely go for 7th week as the answer.