A patient starting infertility treatment is having her fallopian tubes checked for patency.
What test will she need to have performed?

Choice A rationale

Delaying pregnancy for two years is an overly restrictive recommendation and not scientifically supported as a universal precaution for Zika exposure. While a waiting period is advised after potential exposure, a blanket two-year delay is excessive and not aligned with current public health guidelines, which typically suggest shorter intervals depending on the specific exposure and gender.

Choice B rationale

Zika virus is a viral infection, not bacterial. Therefore, antibiotics, which target bacterial pathogens by inhibiting their growth or killing them, would be ineffective in treating Zika virus. Antivirals are sometimes used for viral infections, but there is no specific antiviral treatment for Zika virus, and management is primarily supportive.

Choice C rationale

Zika virus infection during pregnancy, especially in the first trimester, is causally linked to severe birth defects, most notably microcephaly, a condition characterized by an abnormally small head and incomplete brain development. The virus can cross the placental barrier and directly damage fetal neural progenitor cells, disrupting normal neurodevelopment.

Choice D rationale

While avoiding mosquitoes is crucial for preventing Zika virus transmission, simply stating "you will be fine" is a highly irresponsible and scientifically inaccurate response. It minimizes the serious risks associated with Zika infection during pregnancy and fails to provide adequate information or appropriate precautions.

Choice A rationale

The germ layer refers to the primary layers of cells that form during embryonic development, giving rise to all tissues and organs. While essential for overall fetal development, germ layers themselves are not directly responsible for the physiological exchange of gases between maternal and fetal bloodstreams.

Choice B rationale

The blastocyst is an early stage of embryonic development characterized by an inner cell mass and an outer layer (trophoblast). It implants into the uterine wall. While crucial for implantation and initiating placental development, the blastocyst itself does not facilitate the primary gas exchange process.

Choice C rationale

Chorionic villi are finger-like projections of the chorion that extend into the maternal decidua, significantly increasing the surface area for efficient exchange of oxygen, carbon dioxide, nutrients, and waste products between the maternal and fetal circulations. They form the functional unit of the placenta.

Choice D rationale

The decidua basalis is the maternal portion of the placenta, formed from the endometrium after implantation. While it provides the maternal blood supply and contributes to the structural integrity of the placenta, the primary responsibility for the actual gas exchange across the placental barrier lies with the fetal chorionic villi.