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Retinol level: what the analysis shows and how to monitor it
Retinol, or vitamin A, is a fat-soluble compound that performs a number of important functions in the human body. Its level in the blood is an important marker for both general health and for diagnosing vitamin A deficiencies or excess. In this article, we will look at why retinol levels are measured, how the test is performed, and what factors affect the result.
The importance of retinol for the body
Retinol is necessary for:
vision, especially twilight
protein synthesis and cell growth
formation of an immune response
protection of mucous membranes and skin
antioxidant protection organism
Retinol deficiency is most often manifested by reduced vision in the dark (night blindness), dry skin, frequent colds, and growth retardation in children.
When to check your retinol levels
A doctor may prescribe a retinol test in the following cases:
symptoms avitaminosis A (visual impairment, dry skin, frequent infections)
disease liver, intestines, pancreas
alcoholism or prolonged malnutrition
CONTROL vitamin A supplements (risk of hypervitaminosis)
screening of children with signs of physical development delay
How is the retinol level test performed?
To determine the level of retinol, use venous blood. The analysis is carried out by the method high-performance liquid chromatography (HPLC) or spectrophotometry. These are highly accurate laboratory techniques that allow you to detect the concentration of retinol even in low quantities.
Preparation for analysis
Before donating blood, it is recommended to:
not eating for 8–12 hours
eliminate alcohol in 48 hours
do not take fat-soluble vitamins (especially A, D, E, K) at least 3 days
inform the doctor about the appointment antiepileptic or hormonal drugs
Normal indicators
| Category | Retinol level (μg/dL) |
|---|---|
| Adults | 30–80 |
| Children under 5 years old | 20–50 |
| Low | <20 |
| Potentially toxic level | >120 |
A decrease below 20 mcg/dL indicates a deficiency. A level above 100 mcg/dL may signal an excess, which is dangerous for the liver and nervous system.
What affects the result?
In addition to nutrition, the following can distort the analysis result:
jaundice or liver disease
use of vitamin complexes
medications that alter fat absorption (e.g. Orlistat)
inflammatory processes (low retinol due to infections)
state of fat metabolism (hypercholesterolemia)
How to restore retinol levels
Based on the results of the analysis, the doctor may prescribe vitamin A in the form of retinol acetate or palmitate. Daily intake for adults is 700–900 mcg, for children — 300–600 mcg. Sources of vitamin A are:
liver, fish oil
carrot, pumpkin, sweet pepper
eggs, butter
green (parsley, spinach)
It is important to get tested before using supplements, as excess retinol can cause headache, nausea, loss of appetite, brittle nails and hair.
The retinol level is a simple but informative indicator that helps to detect both a deficiency and a potential excess of vitamin A in time. Its regular monitoring is especially important for people with chronic gastrointestinal diseases, women during pregnancy, and children during periods of active growth.
