A pregnant women who is 7 weeks from her LMP comes in to the office for her first prenatal visit. Her previous pregnancy ended in a missed aboion in the first trimester. Which of the following modalities will allow you to best document fetal hea action?: (A) Regular stethoscope, (B) Fetoscope, (C) Fetal Doppler equipment, (D) Transvaginal sonogram
Answer is D. Transvaginal sonogram(TVS) will be able to detect the fetal cardiac activity as early as 5 weeks of gestation. Sac Cardiac activity TVS 4+ weeks 5+ weeks TAS 5+ weeks 6+ weeks >12 weeks FHS heard with fetal doppler Regular stethoscope and fetoscope can detect fetal hea sounds by 20 to 24 weeks of gestation.