Skip to content

Total Antioxidant Capacity of Biological Fluids (Serum/Plasma)

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

This test measures the overall ability of your blood or other bodily fluids to neutralize harmful free radicals, which can help protect cells from oxidative damage.

Quick summary

["Assesses your body’s natural antioxidant defenses."]

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

Key facts at a glance

LOINC
82711-3
Short code
CTA LE ves-Bl
Synonyms
CTA LE ves-Bl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct-angio
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 It’s Done

Doctors may order this test to evaluate your risk of oxidative stress-related conditions, such as chronic inflammation, cardiovascular disease, or certain types of cancer. It can also help monitor treatment responses in conditions where antioxidants play a role, like metabolic disorders or autoimmune diseases.

What to Expect

A small blood sample is typically drawn from your arm. If you’re tested for urine or other fluids, instructions will be provided to collect a sample at home or in a clinic. The sample is then sent to a lab for analysis.

Common Conditions Monitored

This test may be used in cases of suspected oxidative stress, such as in patients with diabetes, heart disease, or those undergoing chemotherapy. It can also be part of a broader evaluation for conditions where antioxidants are known to be deficient or elevated.

What the Results Mean

Results don’t provide a single diagnostic answer but offer insight into your body’s antioxidant capacity. High levels may indicate strong natural defenses, while low levels could suggest increased oxidative damage or a need for additional support.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

While not a standalone diagnostic test, lower than expected antioxidant levels may signal underlying health concerns that could benefit from lifestyle changes, dietary adjustments, or medical interventions to support antioxidant production or intake.

Short name

Total Antioxidant Level

Frequently asked questions

What does a low total antioxidant capacity mean?
A low total antioxidant capacity might suggest your body is struggling to protect itself from oxidative damage, which could be linked to chronic inflammation, poor diet, or certain medical conditions. It doesn’t diagnose a specific illness but may prompt further evaluation or recommendations for antioxidants in your diet or supplements.
How often should this test be done?
The frequency depends on your health status and any conditions being monitored. Your healthcare provider will determine if regular testing is needed, often as part of ongoing management of chronic diseases or preventive care.
Can diet affect the results of this test?
Yes, diet plays a role. Foods rich in antioxidants (like fruits, vegetables, nuts, and fatty fish) can influence your test results. Avoiding alcohol and smoking for a few days before testing may also help provide more accurate 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