Skip to content

Vitamin C (Ascorbic Acid) in Serum or Plasma by Mass Concentration

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

This test measures the amount of vitamin C (ascorbic acid) in your blood. Vitamin C is an essential nutrient that helps protect cells, supports immune function, and aids in healing.

Quick summary

["Check your vitamin C levels to ensure proper nutrition and health support."]

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

Key facts at a glance

LOINC
1902-6
Short code
Vit C Bld-mCnc
Synonyms
Vit C Bld-mCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms of vitamin C deficiency, such as fatigue, frequent infections, or slow wound healing. It can also be used to monitor vitamin C levels in people taking supplements or those with conditions affecting absorption, like malabsorption syndromes.

What Does the Test Involve?

A blood sample is taken from a vein, usually in your arm. The sample is then sent to a lab for analysis using a specialized technique to measure the precise amount of vitamin C in your blood.

What Are Common Results?

Results are reported as the mass concentration of vitamin C in the blood, though specific reference ranges may vary by lab. Your provider will interpret the results in relation to your overall health and symptoms.

What Might Affect Results?

Several factors can influence vitamin C levels, including diet, smoking, alcohol consumption, certain medications (like some antibiotics or diuretics), and underlying health conditions. Recent physical activity or stress can also temporarily affect levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Vitamin C Level

Frequently asked questions

What Are Possible Causes of Low or High Results?
Low vitamin C levels may indicate deficiency, which can lead to scurvy or other health issues. High levels might be due to supplements, certain medications, or metabolic conditions. Your provider will consider your medical history and symptoms to determine the cause.
How Often Should This Test Be Done?
The frequency depends on your health status. If you’re taking vitamin C supplements or have a condition requiring monitoring, your provider may recommend regular testing. Otherwise, this test is usually done as needed for diagnosis or management.
What Are the Risks or Side Effects?
The most common risk is mild discomfort or bruising at the injection site. Blood tests are generally safe, but rare complications like infection or excessive bleeding can occur.
  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