Early date for detection of fetal hea :
High-Yield Explanation
1st Trimester Scan: Assessment of Early Pregnancy and Fetal Viability: Gestational sac - 4.5 weeks, Yolk sac- 5 weeks, Fetal node- 6 weeks, Fetal hea- 6 weeks Reference: Dutta's Textbook of Obstetrics 7th edition page no 68