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ID:217 Vitamin A
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DescriptionVitamin A is one of the fat soluble vitamins. It is essential for normal vision and structure and function of the skin and mucous membranes. It has an essential role during embryogenensis and development. If taken in excess it is hepatotoxic and can interfere with calcium and bone metabolism. During pregnancy excess vitamin A can be teratogenic.
IndicationPatients at risk of malabsorption or with significant liver disease.
Additional InfoVitamin A status is assessed by measuring plasma or serum retinol concentration. Chronic vitamin A deficiency can present as “night blindness” and if untreated may lead to permanent loss of sight.
Concurrent TestsC-reactive protein (CRP)
Dietary Requirements
InterpretationPlasma vitamin A concentration may be decreased during the inflammatory response. CRP should be measure to aid interpretation. Vitamin A may be elevated secondary to renal impairment. This may increase the risk of toxicity.

DepartmentSpecialist Laboratory Medicine
SampleBlood
TubeSerum or Heparin
Tube Picture
Collection ConditionsFasting sample preferred.
Min. Vol3 mL (adults)
Freq.Weekly

Ref. Range (Male)1.05 - 3.39
Ref. Range (Female)1.05 - 3.39
Ref. Range (Paed)0.7 - 3.14
Ref. Range Notes
Unitsumol/L
IP Acute TAT- Contact Laboratory
IP Routine TAT14 days
GP Acute TAT- Contact Laboratory
GP Routine TAT14 days
Turnround CommentNA

Originally edited by : Liz Fox. Review due on 17/05/2020 09:44:46. Published By RB on 17/05/2019 09:44:46.