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Vitamin A

Laboratory:Clinical Biochemistry
Test Code:VIT A
Specimen Types:Serum
Container Types:
SST
Collection & Request Instructions:Collect on Ice
Transport Instructions between Sites and/or Laboratories:Send to lab immediately
Protect from Light
Additional Notes:

Reference Range:

Adult:  1.0—2.8 umol/L

1 - 6 y.o:  0.7—1.5 umol/L

Vitamin A is measured as retinol by HPLC-UV. Retinol levels below 0.7 umol/L are diagnostic of Vitamin A deficiency, while levels of  0.7—1.0 umol/L are borderline deficient. Retinol levels above 2.6 umol/L have been associated with an increased risk of fracture (N Engl J Med 348:287-294, 2003).