From 23 March 2026, newborn babies in Scotland will be routinely tested for spinal muscular atrophy, a first in the UK. The programme is being introduced as a two-year pilot study.
Spinal muscular atrophy (SMA) is a rare genetic condition that affects motor neurons, the nerve cells responsible for all muscle movements. As these cells slowly deteriorate, muscles weaken, thereby affecting movement, breathing and swallowing. In its most severe form, it can be fatal in early childhood. Unfortunately, symptoms only appear after irreversible damage has occurred. The human body does not always fail in loud, dramatic ways. Sometimes, it just slowly fades.
In recent years, treatment for SMA is moving towards disease-modifying therapies, including gene-based interventions. But these treatments cannot reverse damage that has already occurred, only preserving what remains.
Timing is thus everything. A test performed just days after birth can change a life’s whole trajectory. Detecting the condition before symptoms appear allows treatment to begin while there is still hope and the motor neurons are still intact.
The screening operates with an overwhelmingly simple science. A few drops of blood, that are already collected under standard procedures for other conditions, are analysed for the genetic mutation. No new procedure, no additional burden. Still, despite the availability and existing techniques, screening is not routinely done by the NHS. This hard to justify.
There also exists broader issues of consistency. If early detection can determine the rest of a baby’s life, then access to screening becomes a question of equality rather than innovation. A child’s prognosis should not depend on where they are born, and yet, it does.
Scotland’s approach demonstrates that this barrier was never scientific. The tests exist. The only challenge is integrating them into the system that allows access to all.
“A healthcare worker extracting a blood sample from the right big toe of an infant. Original image sourced from US Government department.” by Centers for Disease Control and Prevention is marked with CC0 1.0.