Newborn screening at birth

Why every newborn should be screened at birth

8/18/2026 quality; healthcare

<img src="/nairobi/PublishingImages/Pregnancy%20body%20image.jpg" alt="" style="margin: 5px; font-family: helvetica;"/> A baby's first cry is often seen as a sign of perfect health, but some of the most serious medical conditions in newborns are completely invisible at birth. Hidden beneath the surface, these disorders can silently begin to cause irreversible harm within days or weeks if left undetected.A newborn may look completely healthy in the first hours and days of life. During this period, attention is usually centered on feeding, sleep, bonding and recovery after delivery, but there is a critical and often overlooked step in early infant care, newborn screening. This simple test identifies babies who are at risk of serious disorders that are treatable, but not obviously visible at birth. Newborn screening is a standard of care and is strongly recommended for all babies at birth.Screening for babies at birth is based on a simple but powerful principle that many serious childhood conditions are not immediately visible at birth, yet they begin to cause harm very early in life. Without timely detection, some of these conditions may only be recognized once symptoms start to show, by which point irreversible damage may already have occurred. This can include developmental delays, intellectual impairment, physical disability, or in severe cases, life-threatening illness.The process itself is simple, safe and minimally invasive. It involves collecting a few drops of blood from the baby's heel using a heel prick. The blood is placed on a special filter paper and sent to the laboratory for analysis. The heel is ideal because it provides a safe and practical site for obtaining a small blood sample in newborns. Compared to drawing blood from a vein, the heel prick is less invasive and generally better tolerated. Although the baby may cry briefly during the procedure, the discomfort is short-lived and does not require any treatment.Timing plays a key role in accuracy. The sample should be collected between 48 and 72 hours after birth. This allows enough time for certain metabolic processes to stabilize after delivery, ensuring that test results are more reliable while still enabling early detection within the critical newborn period.At Aga Khan University Hospital, Nairobi, the newborn screening program currently includes testing for several important conditions including congenital hypothyroidism, congenital adrenal hyperplasia, cystic fibrosis, galactosemia and sickle cell disease. While many of these disorders are individually rare, their combined impact is significant. Early identification allows for timely treatment that can prevent severe complications and support normal growth and development.Some of these conditions can also affect the brain and neurological development if they remain undiagnosed. For example, untreated congenital hypothyroidism can result in intellectual disability due to impaired brain development. Severe galactosemia may also lead to neurological complications if not managed early. Although the screening panel does not directly test for primary neurological conditions such as epilepsy or cerebral palsy, it does identify metabolic and genetic disorders that can indirectly affect neurological outcomes. This makes early detection even more critical in protecting long-term developmental health.Once testing is complete, results are reviewed by healthcare providers. An abnormal result does not necessarily mean a baby has a disorder. Instead, it indicates that further evaluation is required. This may involve repeat testing or confirmatory investigations to determine whether a condition is truly present. Early follow-up ensures that, if a disorder is confirmed, treatment can begin as soon as possible.In some situations, a repeat test may be necessary. This can occur if the original sample was insufficient, improperly collected, or taken after the baby has received a blood transfusion, which can affect accuracy. A repeat may also be recommended based on clinical judgement by the healthcare provider.A normal result provides reassurance but does not completely exclude all possible disorders. Some conditions may not be detected through screening, and others may develop symptoms later in infancy. For this reason, ongoing observation of the baby's growth and development remains essential. If any concerning signs arise, further medical evaluation is required regardless of screening results.The strength of newborn screening lies not only in what it detects, but in what it prevents. Many of the conditions screened are rare individually, apart from sickle cell disease, which is more common in certain populations. However, when considered together, they represent a significant group of conditions where early diagnosis can prevent serious harm. This is why screening is recommended for all newborns, regardless of background or perceived risk.In the broader context of child health, newborn screening stands out as one of the most effective early interventions available. It is quick, safe and inexpensive relative to the long-term cost of untreated disease, yet its impact can be lifelong. For some families, it brings reassurance. For others, it becomes the starting point for timely treatment that prevents disability and improves survival.
In many ways, newborn screening represents a shift in how healthcare approaches prevention. It is a reminder that some of the most important moments in a child's health journey happen long before symptoms are ever seen.
By Dr. Daniel Maina, Assistant Professor, Aga Khan University Medical College and Consultant Pathologist at Aga Khan University Hospital, Nairobi

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Why every newborn should be screened at birth

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