In a neonate with the skin of soles and palms showing yellow discoloration, the approximate?level of serum bilirubin (mg/dl) will be:
**Core Concept**
The yellow discoloration of the skin on soles and palms in a neonate is a clinical manifestation of jaundice, which is caused by elevated levels of bilirubin in the blood. Bilirubin is a byproduct of the breakdown of hemoglobin in red blood cells, and its accumulation can cause jaundice.
**Why the Correct Answer is Right**
In neonates, the liver is still immature and cannot efficiently conjugate and excrete bilirubin. As a result, bilirubin levels can rise, causing jaundice. The skin of the soles and palms is particularly affected due to its rich vascular supply, which allows bilirubin to be deposited in these areas. The level of serum bilirubin that causes jaundice in neonates is typically above 5 mg/dl.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is an incorrect option as the level of bilirubin is too low to cause jaundice.
* **Option B:** This option is also incorrect as the level of bilirubin is not high enough to cause jaundice in neonates.
* **Option C:** This option is incorrect as the level of bilirubin is too high and would likely cause kernicterus (bilirubin encephalopathy).
**Clinical Pearl / High-Yield Fact**
In neonates, the level of serum bilirubin that causes jaundice can be estimated by using the following rough guide: mild jaundice (5-8 mg/dl), moderate jaundice (8-12 mg/dl), and severe jaundice (>12 mg/dl).
**Correct Answer:**
Correct Answer: C.