At what gestational age does the placenta start dying/rotting?

• A. 37 weeks
• B. 43 weeks and above
• C. 28 weeks
• D. 40 weeks

Answer: (B)

Placental aging progresses as gestation advances. By term, the placenta shows aging changes such as calcifications and reduced villous reserve, and these changes become markedly evident once pregnancy goes beyond 42 weeks. When the pregnancy reaches 43 weeks and above, the placenta’s functional reserve is significantly diminished, which is why this is the point where it’s described as “dying/rotting” or markedly aging. So, the most appropriate choice is 43 weeks and above.

The other options fit term or near-term but don’t reflect the stage where aging is clearly pronounced: 37 weeks is term but not typically when placental aging is evident; 40 weeks is term with ongoing aging but not as clearly as post-term; 28 weeks is far too early for this level of placental aging.