Question

When does beta-hCG become detectable in the serum?

a) Immediately after conception
b) 1 week after conception
c) 2 weeks after conception
d) 4 weeks after conception

Answer 1

Beta-hCG becomes detectable in the serum 2 weeks after conception.

Step-by-step explanation:

In humans, beta-hCG becomes detectable in the serum 2 weeks after conception. After fertilization, the developing embryo implants into the uterine wall within seven days. The outer layers of the blastocyst release beta-hCG, which makes its way to the corpus luteum and maintains the endometrium for the developing embryo. Pregnancy tests detect the presence of beta-hCG in urine or serum.