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Total Antioxidant Capacity (Serum or Plasma)

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

This test measures the overall ability of your blood to neutralize harmful free radicals, which can cause cell damage. Healthy antioxidant levels help protect your cells and support overall health.

Quick summary

["Assesses your body’s natural defense against oxidative stress."]

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

Key facts at a glance

LOINC
81813-8
Short code
F11 Mut Anl Bld/T
Synonyms
F11 Mut Anl Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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

What Does This Test Measure?

This test evaluates the combined activity of various antioxidants in your blood, including vitamins (like vitamin C and E), enzymes, and other molecules that help prevent oxidative damage. The result reflects your blood’s capacity to scavenge free radicals, which are unstable molecules that can harm cells.

Why Might You Need This Test?

Doctors may order this test to evaluate your risk of chronic diseases linked to oxidative stress, such as heart disease, certain cancers, or aging-related conditions. It can also help monitor treatment responses in patients with conditions like diabetes or chronic inflammation.

Common Uses and Indications

This test is sometimes used in research or specialized clinical settings to assess general health, but it is not a routine screening test for most conditions. It may be part of a broader evaluation if you have symptoms of oxidative stress or specific health concerns.

How Is This Test Performed?

A small blood sample is drawn from your arm, typically in a lab setting. The blood is processed to measure the total antioxidant capacity, which is then compared to standard reference values for your age and health status.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Antioxidant Level

Frequently asked questions

What Does a High or Low Result Mean?
A high total antioxidant capacity may indicate strong natural defenses against oxidative damage, which could be beneficial for preventing chronic diseases. However, it does not replace other health assessments. A low result might suggest increased oxidative stress, which could be linked to underlying health issues or lifestyle factors.
How Often Should I Get This Test?
There is no standard schedule for this test as it is not widely used in routine care. Your healthcare provider will determine if this test is needed based on your medical history, symptoms, or specific health goals.
What Are the Risks or Side Effects?
The most common risk is mild discomfort or bruising at the needle insertion site. There are no known serious side effects from this blood test.
  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