Vitamin A and E

Description: 
Vitamin A (retinol) and E (a-tocopherol) are measured in lithium heparin plasma
Clinical details: 
A vitamers such as retinol and beta-carotene can be found most abundantly in vegetables. Vitamin A is known to play important roles in various physiological processes including vision, maintenance of mucosal barriers, haematopoiesis, bone development, and immunocompetence. The mode of action is believed to be via its antioxidant properties.
The antioxidant properties of vitamin E are essential for the prevention of the peroxidation of phospholipids, particularly in cell membranes. The mechanism by which it exerts its protective effect is the absorption of peroxyl radicals which results in the termination of the free radical chain reaction. Vitamin E also stimulates the immune system and is antiatherogenic.
Measurement of vitamins A and E can be used to diagnose deficiency or give a useful early warning of deficiency prior to the appearance of symptoms. Similarly measurement of vitamin A is useful in cases of vitamin A toxicity.
Reference range: 

age dependant

Synonyms or keywords: 
Retinol, beta-carotene, alpha tocopherol
Units: 
umol/L
Sample type and Volume required: 
Lithium heparin plasma
Minimum 0.5mL
Call in advance: 
No
Turnaround time: 
10 days
Special sample instructions: 

Protect specimens from light and store frozen at -20 degrees.

Storage and transport: 
First class post
Contacts:
Nutristasis Unit at St Thomas'
0207188 6815 / 89543
St Thomas' Hospital
North Wing - 4th Floor
Westminster Bridge Road
London SE1 7EH

Laboratory opening times
Monday - Friday 09.00 - 17.00
For clinical advice or interpretation of results, please contact the laboratory in the first instance.

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Last updated: 31/07/2020