Question

When can you see the gestational sac on TVU? What beta-hCG level does this correspond to?

a) 4 weeks gestation; 1,000 mIU/mL
b) 5 weeks gestation; 1,500 mIU/mL
c) 6 weeks gestation; 2,000 mIU/mL
d) 7 weeks gestation; 2,500 mIU/mL

Answer 1

The gestational sac is typically visible on a transvaginal ultrasound by 5 weeks of gestation and corresponds to a beta-hCG level of around 1,500 mIU/mL.

Step-by-step explanation:

The gestational sac can usually be seen on a transvaginal ultrasound (TVU) by 5 weeks of gestation. This visualization corresponds to a beta-hCG level of approximately 1,500 mIU/mL. The human chorionic gonadotropin (hCG) hormone is secreted by the trophoblast after implantation and is crucial for maintaining the corpus luteum and hence, the pregnancy. It is the presence of hCG that allows for early detection of pregnancy through urine or blood tests, and its levels increase significantly during the early stages of pregnancy to support the developing embryo.