Galactosemia is an inherited metabolic disorder in which the body cannot break down galactose, a sugar found in milk (lactose). In the classic form, galactose builds up and can cause serious liver problems, infections, and life-threatening illness within days, so early detection and a prompt diet change are critical.
What causes galactosemia
Classic galactosemia is caused by changes in the GALT gene, which makes an enzyme needed to process galactose. It is inherited in an autosomal recessive pattern.
How newborn screening detects galactosemia
Galactosemia is screened for in all U.S. states by measuring GALT enzyme activity and galactose-related markers in the dried blood spot. Because illness can develop very quickly, an out-of-range result is treated as urgent and confirmed promptly.
How galactosemia is managed
The main treatment is removing galactose and lactose from the diet, starting as early as possible, usually with a lactose-free formula. With early dietary management, the most dangerous early complications can be prevented.
Related conditions beyond the standard panel
Standard newborn screening targets classic galactosemia, but it does not cover many other inherited metabolic conditions involving how the body handles sugars and nutrients. Disorders such as hereditary fructose intolerance and several glycogen storage diseases are generally not on state panels. Genomic screening can assess the genes linked to a much broader set of metabolic conditions.
How genomic screening fits in
State screening catches galactosemia well. Fore Genomics’ at-home cheek-swab screen looks at the genes tied to more than 1,000 clinically actionable childhood conditions, including metabolic disorders beyond the standard panel, sequenced in CLIA-certified and CAP-accredited labs with genetic counselor support. See what we screen for or start screening.
Frequently asked questions
Is galactosemia on every state’s newborn screening panel?
Yes. Classic galactosemia is screened for in all U.S. states.
Why is galactosemia treated so urgently?
In the classic form, serious illness can develop within days of birth, so removing galactose from the diet quickly is essential.
Medically reviewed by Fore’s Clinical Team. This article is for general educational purposes and is not medical advice. Sources: HRSA Newborn Screening; National Organization for Rare Disorders (NORD).