Preterm neonates are at increased risk for retinopathy of prematurity until what postconceptual age?

Preterm neonates are at increased risk for retinopathy of prematurity until what postconceptual age?

• A. 36 weeks
• B. 38 weeks
• C. 42 weeks
• D. 44 weeks

Answer: (D)

The timing hinges on retinal vascular development. In preterm infants, the blood vessels in the retina finish growing outward from the optic nerve after birth, and full peripheral vascularization typically completes around 44 weeks postconceptual age (gestational age at birth plus postnatal age). Until that point, the retina can remain incompletely vascularized and vulnerable to abnormal neovascularization in response to factors like oxygen exposure, making retinopathy of prematurity possible. Hence the risk period extends up to about 44 weeks postconceptual age. Earlier milestones such as 36, 38, or even 42 weeks do not reliably mark the end of this risk, because some infants still have immature peripheral vasculature at those times.

The timing hinges on retinal vascular development. In preterm infants, the blood vessels in the retina finish growing outward from the optic nerve after birth, and full peripheral vascularization typically completes around 44 weeks postconceptual age (gestational age at birth plus postnatal age). Until that point, the retina can remain incompletely vascularized and vulnerable to abnormal neovascularization in response to factors like oxygen exposure, making retinopathy of prematurity possible. Hence the risk period extends up to about 44 weeks postconceptual age. Earlier milestones such as 36, 38, or even 42 weeks do not reliably mark the end of this risk, because some infants still have immature peripheral vasculature at those times.