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Vitamin C (Ascorbic Acid) in Urine

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

This test measures the amount of vitamin C, an antioxidant, found in your urine. It helps assess how much vitamin C your body is excreting.

Quick summary

["This test can help identify if your body is producing or losing vitamin C at levels that may need attention."]

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

Key facts at a glance

LOINC
111232-5
Short code
Vit C Msmt Ur
Synonyms
Vit C Msmt Ur
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order a urine vitamin C test to check for conditions like scurvy (a vitamin C deficiency), kidney issues, or to monitor how well your body absorbs or uses vitamin C. It can also be part of a broader evaluation for metabolic or genetic disorders.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to collect a urine sample in a clean container, often over a 24-hour period or at a specific time. Follow your healthcare provider’s instructions carefully to ensure accurate results.

What the Results Mean

Urine vitamin C levels can vary based on diet, hydration, and overall health. High levels might suggest overconsumption of vitamin C or certain kidney conditions, while very low levels could indicate deficiency or malabsorption. Your results will be compared to general reference ranges provided by your lab.

Common Conditions Monitored

This test is sometimes used to monitor conditions like chronic kidney disease, where vitamin C metabolism may be affected, or to evaluate patients with suspected vitamin C deficiency or disorders related to antioxidant balance.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Vitamin C

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may suggest this test if they suspect you have a vitamin C deficiency, kidney problems, or if you’re taking high doses of vitamin C supplements. It can also be part of a broader health assessment, especially in cases of unexplained fatigue, frequent infections, or other symptoms linked to vitamin C deficiency.
What does a high urine vitamin C level usually indicate?
High levels in urine might suggest you’re consuming more vitamin C than your body needs, possibly from supplements or a high-vitamin diet. It could also indicate certain kidney conditions that cause excess excretion. Always discuss results with your healthcare provider.
Do I need to fast before this test?
No fasting is typically required for this test. However, follow any specific instructions your doctor or lab provides, such as timing your urine collection or avoiding certain foods or medications that might interfere with results.
  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