**Question:** Physiological jaundice in preterm infant lasts upto: September 2011

**Core Concept:** Physiological jaundice is a common condition in preterm infants, characterized by increased bilirubin levels due to immature liver function. Bilirubin is a waste product of heme catabolism, and in newborns, it is eliminated primarily through the liver. Preterm infants have immature liver function, which results in delayed clearance of bilirubin, leading to elevated levels.

**Why the Correct Answer is Right:** The correct answer refers to the peak of bilirubin levels in preterm infants. Bilirubin levels typically peak around day 10-14 after birth, with a gradual decline as the liver matures. In the context of the question, "September 2011" is not a relevant time frame. Instead, it is essential to focus on the peak bilirubin levels in preterm infants.

**Why Each Wrong Option is Incorrect:**

A. This answer is incorrect because it mentions a specific date (September 2011), which is irrelevant to the duration of physiological jaundice in preterm infants.

B. This answer incorrectly states that jaundice lasts for "5-7 days," which is not accurate for physiological jaundice in preterm infants. The correct answer addresses the peak bilirubin levels and their duration.

C. This answer incorrectly mentions "2 weeks," which is also not accurate for physiological jaundice in preterm infants. The correct answer focuses on the peak bilirubin levels and duration.

D. This answer incorrectly states "14 days," which is not the duration of physiological jaundice in preterm infants. The correct answer addresses the peak bilirubin levels and duration.

**Clinical Pearl:** Physiological jaundice in preterm infants is a normal physiological response that peaks around day 10-14 and typically resolves by day 21. It is essential for healthcare providers to understand this duration to monitor and manage bilirubin levels appropriately in these infants, preventing complications such as kernicterus.