Hypercarotenemia in children with Down's syndrome.

Area of Science:

• Biochemistry
• Pediatrics
• Genetics

Background:

• Previous studies suggested frequent serum vitamin A deficiencies in individuals with Down's syndrome.
• This led to recommendations for routine carotene and vitamin A level monitoring in this population.
• The standard diagnostic methods may have influenced prior findings.

Purpose of the Study:

• To investigate serum carotene and vitamin A levels in children with Down's syndrome.
• To assess the prevalence of deficiencies and identify potential hypercarotenemia.
• To evaluate the accuracy of current monitoring practices.

Main Methods:

• Serum samples were collected from 44 fasting patients with Down's syndrome (aged 14 months to 19 years).
• Vitamin A and carotene levels were measured using high-performance liquid chromatography (HPLC).
• Results were compared to established reference ranges, noting differences from older spectrophotometric methods.

Main Results:

• No participants exhibited deficiencies in serum carotene or vitamin A.
• A significant finding was hypercarotenemia in 14 patients (31.8%).
• No common causes for hypercarotenemia (e.g., excessive intake, diabetes, hypothyroidism) were identified.

Conclusions:

• Routine monitoring for vitamin A deficiency in Down's syndrome may not be warranted.
• Hypercarotenemia is a notable finding in this population, requiring further investigation.
• Improved HPLC methods reveal different normal ranges and findings compared to older techniques.