Reference Intervals:
0 - 30 days: 0.6 - 1.8 µmol/L
1 m - <7 yrs: 0.7 - 1.5 µmol/L
7 - 13 yrs: 0.9 - 1.7 µmol/L
13 - <19 yrs: 0.9 - 2.5 µmol/L
>19 yrs: 1.0 - 2.5 µmol/L
Vitamin A is measured as retinol by HPLC-UV. Retinol levels below 0.7 µmol/L are diagnostic of Vitamin A deficiency, while levels of 0.7-1.0 µmol/L are borderline deficient.
Retinol levels above 2.6 µmol/L have been associated with an increased risk of fracture (N Engl J Med 348: 287-294, 2003).
Please note: revised reference intervals from 31/07/2023.
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