Test library
Vitamin A Level Test
This blood test measures vitamin A (retinol) to check for deficiency or excess. Vitamin A supports vision, immune function, and skin health, and low levels can be linked to night vision problems.
Order Vitamin A Deficiency Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Vitamin A Deficiency Test- Typical turnaround
- 1-3 business days
- Starting price
- From $116
- Results
- Confidential, online
Quick answer
The vitamin A test measures the level of retinol in the blood. Vitamin A is a fat-soluble nutrient involved in vision, immune defense, and the health of skin and mucous membranes. The test is ordered when a deficiency is suspected or when a healthcare provider wants to confirm that intake is adequate. It uses a blood sample and is interpreted alongside diet and symptoms.
What this test measures
Vitamin A refers to a group of related compounds, with retinol being the form most often measured in blood. It is essential for producing rhodopsin, a pigment in the retina that allows vision in low light. The nutrient also supports immune cell function and helps maintain the surface tissues of the eyes, airways, and skin.
The test typically measures serum retinol, sometimes reported alongside retinol-binding protein or beta-carotene. Because vitamin A is fat-soluble, it is stored in the liver, and blood levels can stay normal until stores are significantly depleted. Results can be affected by inflammation, liver disease, and recent intake, so interpretation needs context.
Deficiency is uncommon in well-nourished populations but can occur with malabsorption, restrictive diets, or certain medical conditions. Symptoms may include difficulty seeing in dim light, dry eyes, and increased susceptibility to infections. Excessive vitamin A is also possible and can cause other problems, so testing is used to look at both directions.
- Serum retinol (vitamin A)
- Retinol-binding protein
- Beta-carotene
- Vitamin A to retinol-binding protein ratio
- Serum vitamin A reference range comparison
- Related fat-soluble vitamin markers when ordered together
Why people order this test
- Evaluate suspected vitamin A deficiency
- Investigate night vision or dry eye symptoms
- Monitor nutrition in malabsorption conditions
- Check vitamin A status before or during certain treatments
- Assess intake on a highly restrictive diet
- Follow up on abnormal liver or fat absorption findings
How to prepare
Fasting may be requested by some laboratories, so follow the collection instructions provided with the order. A blood sample is drawn from a vein, usually at the arm. Tell the ordering provider about any supplements you take, since recent intake can influence results.
Understanding your results
Results are normally available within one to three business days. The report shows the serum retinol level and how it compares with the reference range. Both low and high values can be significant, and a healthcare provider interprets them with diet, symptoms, and other findings.
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Frequently Asked Questions
What does the vitamin A test measure?
It measures retinol, the main form of vitamin A circulating in the blood. Some versions also measure related markers such as retinol-binding protein or beta-carotene.
Why would a doctor order a vitamin A test?
It is ordered when deficiency is suspected, such as with night vision changes, malabsorption, or a limited diet. It can also help check for excess intake.
Do I need to fast for this test?
Some laboratories ask for fasting and some do not. Follow the specific instructions supplied with the order.
Can supplements affect the result?
Yes. Recent vitamin A intake can raise blood levels, so share your supplement list with the ordering provider.
What symptoms are linked to low vitamin A?
Low levels can be associated with difficulty seeing in dim light, dry eyes, and more frequent infections, but these symptoms have many causes and need clinical evaluation.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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