Neonatal Jaundice Made EASY | Red Flags You MUST Know for OSCEs

Neonatal jaundice is one of the most common paediatric presentations you will encounter in both exams and clinical practice. While most cases are physiological and harmless, recognising the red flags is essential to avoid missing serious underlying pathology.

In this episode of OSCE Talk, we break neonatal jaundice down into a clear, structured approach that you can apply in OSCEs and on the wards.

We cover the key pathophysiology, including how bilirubin is produced and processed, and why unconjugated bilirubin can cross the blood–brain barrier and cause neurological injury. Understanding this is crucial when thinking about complications such as kernicterus.

We then explain physiological jaundice, including its typical onset after 24 hours of life, peak around days 3 to 5, and resolution within the first one to two weeks. This helps you build a strong baseline before identifying what is abnormal.

The most important part is recognising pathological jaundice. You should always be concerned if jaundice appears within the first 24 hours, persists beyond 14 days, or is associated with pale stools and dark urine. These features suggest serious conditions such as haemolysis, sepsis, or biliary atresia. A baby who is lethargic, feeding poorly, or clinically unwell should always raise suspicion.

We also go through investigations in a practical way, including when to use transcutaneous bilirubin measurements and when serum bilirubin is required. Differentiating between conjugated and unconjugated bilirubin is key to guiding diagnosis and management. Other important tests include blood group compatibility, Coombs testing, and infection screening where appropriate.

From an OSCE perspective, we outline how to structure your history and examination. This includes focusing on timing, feeding, stool and urine colour, and red flag symptoms, as well as performing a targeted examination for hydration, neurological status, and abdominal findings.

Finally, we cover management, including the use of NICE treatment threshold charts, phototherapy as first-line treatment, and when escalation to exchange transfusion is required.

This is a high-yield topic that frequently appears in OSCEs and written exams. Mastering neonatal jaundice will not only help you perform well in assessments but also ensure safe clinical practice.