Bilirubin Neonate, Serum (BNS)

This test is crucial for evaluating neonatal jaundice and monitoring liver function in newborns.

Normal Range

• Newborns (0-24 hours): 2-6 mg/dL
• Newborns (24-48 hours): 6-8 mg/dL
• Newborns (48-72 hours): 8-12 mg/dL
• Newborns (72+ hours): 10-14 mg/dL
  Note: Levels higher than 14 mg/dL after 72 hours may indicate pathological jaundice.

Function in the Body

Bilirubin is a yellow pigment produced during the breakdown of red blood cells. In newborns, excess bilirubin is processed by the liver and excreted in the stool and urine. It is a vital marker for assessing liver function and ensuring proper red blood cell turnover.

Diseases Revealed by the Test

• Neonatal Jaundice (Physiological): Common in newborns due to immature liver function.
• Pathological Jaundice: Caused by infections, blood group incompatibility, or enzyme deficiencies.
• Liver Disorders: Includes hepatitis or congenital liver dysfunctions.
• Hemolytic Anemia: Excessive breakdown of red blood cells leading to high bilirubin levels.

Symptoms

Elevated Bilirubin (Hyperbilirubinemia)

• Yellowing of the skin and eyes (jaundice)
• Poor feeding
• Lethargy
• Dark-colored urine

Low Bilirubin

• Typically not clinically significant, but may indicate overly aggressive treatment for jaundice.

Symptoms of Deficiency and Overdose

• Deficiency Symptoms: Rare and usually harmless.
• Overdose Symptoms: Severe jaundice and kernicterus (a rare but serious condition where excess bilirubin damages the brain).

Diagnosis

• Blood Sample: A small blood sample, usually obtained via a heel prick, is used to measure serum bilirubin levels.
• Assessment: The test helps determine the severity of jaundice and whether treatment, such as phototherapy or exchange transfusion, is needed.

Frequently Asked Questions

1. What causes high bilirubin in newborns?
   High bilirubin levels can result from immature liver function, infections, or blood type incompatibilities.
2. Is jaundice dangerous for newborns?
   Mild jaundice is common and typically harmless, but severe jaundice requires prompt medical attention to prevent complications.
3. How is high bilirubin treated?
   Treatment may include phototherapy (light therapy) or, in severe cases, exchange transfusion.
4. Can jaundice be prevented?
   Early and frequent breastfeeding can help reduce bilirubin levels by promoting regular bowel movements.