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Vitamin A (Retinol) in Serum

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of vitamin A, an essential nutrient important for vision, immune function, and skin health.

Quick summary

["Vitamin A helps protect your eyesight and supports your body’s immune system."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
80597-8
Short code
RSV A 5' UTR RNA Nph Ql NAA+probe
Synonyms
RSV A 5' UTR RNA Nph Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to check for vitamin A deficiency, which can cause vision problems, weakened immunity, or other health issues. It may also be used to monitor vitamin A levels in people with certain medical conditions, like liver disease or malabsorption disorders, or those taking supplements.

What to Expect Before the Test

No special preparation is needed for this blood test. You may be asked to fast for 8–12 hours before the draw, but always follow your provider’s instructions. Bring any supplements or medications you’re taking to discuss with them.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. The process is quick and usually painless. You may feel a slight pinch, but most people tolerate it well.

What Are Possible Results?

Results are compared to a general reference range for healthy adults, but your specific range may vary based on age, health status, or other factors. Low levels may indicate deficiency, while very high levels could signal liver disease or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum Retinol

Frequently asked questions

What Does a Low Vitamin A Level Mean?
Low vitamin A levels may suggest a deficiency, which can lead to night blindness, repeated infections, or poor wound healing. Deficiency is more common in people with poor diets, liver disease, or digestive issues that prevent absorption.
What Does a High Vitamin A Level Mean?
Elevated vitamin A can occur with liver disease, certain medications, or excessive vitamin A intake. Chronic high levels may cause toxicity, including headaches, nausea, or skin changes.
How Often Should I Get This Test?
Your provider will determine how often you need this test based on your health history and symptoms. Routine adults typically don’t need it unless they have risk factors like malnutrition or liver issues.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy