Prevention Strategies For Kernicterus

Overview

What is kernicterus?

Kernicterus is a rare condition that can happen when newborn jaundice is not properly treated. It occurs when high levels of bilirubin (a yellowish pigment which is produced during the breakdown of red blood cells) build up in the baby’s brain. Normally, the liver helps remove bilirubin from the body, but if it does not work efficiently, bilirubin can accumulate in the blood, leading to jaundice. If the levels become too high and bilirubin crosses the blood-brain barrier, it can settle in areas of the brain like the basal ganglia (which helps control movement and learning habits), causing permanent brain damage.¹ 

Signs

• Yellowing of the skin and eyes (jaundice)
• Having trouble feeding
• High-pitched crying
• Extreme sleeplessness, feeling lethargic or sluggish
• Muscle stiffness or floppiness
• Seizures
• Arching of the back
• Irritability
• Pauses in breathing (apnoea)
• General weakness or missing reflexes

In more severe cases, if kernicterus is not treated properly, it can lead to long-term neurological issues such as hearing loss, cerebral palsy, or intellectual disabilities.

Epidemiology

Kernicterus primarily affects newborns, and some ethnic groups are at a higher risk of developing kernicterus than others. Newborns of African and South Asian descent are more likely to develop kernicterus due to both genetic factors and having a higher bilirubin level. It is also known to affect males more frequently than females.¹ Black newborns, who represent only 14% of births, account for around 25% of kernicterus cases. This reveals a significant health disparity in this population.² Similarly, in the UK, babies from ethnic minority groups also face a higher risk, with an estimated 0.9 cases per 100,000 live births.³ 

Prevention

The best and first step to prevent kernicterus is to detect jaundice early. Timely detection is crucial to avoid serious, long-term neurological damage. While not every baby with jaundice will develop kernicterus, early monitoring and intervention can make all the difference.

Monitoring after birth

Right after birth, babies should be closely monitored for any signs of jaundice. This usually starts with a visual assessment by healthcare professionals, who look for yellowing of the skin and eyes. However, spotting jaundice can be more difficult in babies with darker skin tones, so doctors often use additional tools like bilirubin blood tests and light-based assessments to get a clearer picture of bilirubin levels.⁴ 

Bilirubin blood tests

To get an accurate measurement of bilirubin in the blood, doctors may perform a blood test. This will help them determine whether the levels are high enough to need treatment, and it can also help them diagnose kernicterus if symptoms are also present.

Transcutaneous bilirubinometry (TcB) 

TcB devices offer a quick, painless way to estimate a baby’s bilirubin levels through the skin. These handheld tools shine a special light on the baby’s skin and can calculate bilirubin levels based on how the light is absorbed. While this is not a replacement for a blood test, it is often the first step in screening. If the readings are high, a blood test will usually follow to confirm and guide treatment decisions. Visual checks alone are not reliable and should not be the only method used in diagnosing, especially for babies with darker skin, which makes TcB an important tool for accurate early detection.⁵ 

Nomograms

Doctors also use nomographs, graphs that compare the baby’s bilirubin levels to their age in hours, to see whether the bilirubin is rising too fast or is already too high. This will help them classify the baby’s risk level (low, medium, or high) for developing complications like kernicterus and inform decisions about whether treatment is needed.⁵ It also helps medical professionals identify which babies need closer monitoring, especially those who are at a medium or high risk.

Follow-up appointments

Even if the baby’s bilirubin levels are normal at first, it is important to go to all follow-up appointments. This is because bilirubin levels can increase quickly in the first few days after birth. These regular check-ups allow doctors to catch any concerning changes early and to take the appropriate action before the bilirubin reaches dangerous levels. Babies discharged before 48 hours after birth will need regular follow-ups, as both the mother and baby should continue to be monitored in the days following birth.⁵ 

Parental education

One of the most effective tools in preventing kernicterus is parent education. Teaching parents what jaundice looks like (yellowing of skin, eyes, poor feeding, and lethargy), can help them act early if they notice unusual symptoms. Parents who understand the risks and the importance of follow-up appointments are more likely to stay on top of appointments and treatment plans, which will decrease their baby’s risk of developing kernicterus. This knowledge also empowers them to know when to seek medical attention if something seems off.

G6PD deficiency

Glucose-6-Phosphate Dehydrogenase (G6PD) is an important enzyme that helps red blood cells function properly. When someone does not have enough of this enzyme, a condition known as a G6PD deficiency, their red blood cells can break down too early and quickly, leading to an increased bilirubin build-up, which can cause anaemia and jaundice. In newborns, this can cause bilirubin levels to rise quickly in the blood, increasing the risk of kernicterus. A study in the US found that 20% of babies diagnosed with kernicterus had a G6PD deficiency. Also, it showed that African American newborns, despite having lower peak bilirubin levels than white newborns, were more likely to develop kernicterus after being discharged, making up 25% of all cases among African American males, with estimates as high as 21% in some areas, suggesting that babies with this condition may experience kernicterus at lower bilirubin levels than those without the deficiency.⁶

In several countries across Africa, Asia, the Middle East, and the Mediterranean, where G6PD deficiency is more widespread, routine newborn screening for this condition has been linked to a decrease in severe jaundice and kernicterus. However, in countries where G6PD deficiency is low or less common, such screening is not always standard practice. This creates an unfair gap and health disparity in care, particularly for ethnic groups who are more likely to carry the deficiency. To address this disparity, universal screening for G6PD deficiency should be considered, regardless of national prevalence rates.⁶

Summary

Kernicterus is a rare but serious condition that happens when newborn jaundice is not treated properly or on time. It occurs when high levels of bilirubin build up in the blood and eventually reach the brain, where it can cause permanent brain damage. Early detection and management of jaundice are important steps in preventing kernicterus and its long-term neurological effects.

There are several effective strategies to help prevent kernicterus. Prevention starts with early recognition and proactive care in the first days after birth. Although not every baby with jaundice is at risk, consistent monitoring is essential. Tools such as visual assessments, bilirubin blood tests, transcutaneous bilirubinometry (TcB), and nomograms help healthcare providers detect rising bilirubin levels and identify which newborns need treatment. Attending follow-up appointments is equally important, as bilirubin levels can increase rapidly even after hospital discharge. Parental education also plays an important role; when parents are informed about the signs of jaundice and the importance of follow-up care, they are more likely to seek help early. Combined, these measures create a strong line of preventative measures against kernicterus.
At the same time, kernicterus highlights the ongoing health disparity that affects certain ethnic groups, particularly babies of African and Asian descent. These populations experience higher rates of kernicterus compared to white infants, partly due to genetic factors such as G6PD deficiency that delay their care. More research and awareness are needed to better understand and address these disparities, ensuring that all newborns, regardless of background, receive the right care they need to stay safe and healthy.