Vitamin A

fS-A-vit KL 1113

Vitamin A is a lipid-soluble vitamin that plays a role in visual sensation, cellular growth and differentiation, and reproductive functions. Vitamin A enhances normal iron metabolism and maintains the normal function of mucous membranes, skin, vision and immune system. Decreased vitamin A levels indicate insufficient vitamin A intake or lipid absorption deficiency, while elevated levels indicate excessive use of vitamin supplements. Children and youth (younger than 19 yrs) have lower vitamin A levels than adults.


Demonstrating vitamin A deficiency or excessive intake.


Blood sample. Requires 12 hours of fasting. Glass of water and usual medication is allowed.
No vitamin A supplements during 12 hours. 


1 mL of serum (minimum 0.5 mL) or lithium heparin plasma (12 hours fasting). Protect from direct sunlight.

Storage and delivery

Delivery at room temperature on the sampling day. Store refrigerated over the weekend, ship at room temperature.


Liquid chromatography (HPLC).

Reference ranges

women 1.1 – 3.1 µmol/L
​men 1.4 – 3.7 µmol/L

Testing frequency

Once per week

Turnaround time

(weekdays) 5 – 10


The same sample may be used to test for vitamin E, KL 3169.