Earliest of fetal heart can be detected at:

Ans. is a, i.e. 6.0-6.5 weeksRef. USG in Obs. and Gynae. Callen 4/e, p 119, 120When the question says--cardiac activity is earliest detected at--it means they are asking about TVS--Transvaginal sonography.On TVS, cardiac activity is seen at 6 weeks.Remember: If the question says cardiac activity is detected at and does not specify TVS or TAS: Then it is TAS--so then answer is 7-8 weeks.So earliest cardiac activity can be detected between 6 to 6.5 weeks.