Test library
Tetanus and Diphtheria Antibody Test
The tetanus and diphtheria IgG immunity test measures antibodies against both diseases to check whether a person has protective immunity after vaccination. It is a blood test often used when vaccination records are uncertain.
Order Tetanus & Diphtheria IgG Immunity Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Tetanus & Diphtheria IgG Immunity Test- Typical turnaround
- 1-3 business days
- Starting price
- From $149
- Results
- Confidential, online
Quick answer
The tetanus and diphtheria IgG immunity test measures antibody levels against both tetanus and diphtheria. These two bacterial infections are serious but preventable through vaccination, and antibody levels can fade over time. The test uses a blood sample to estimate whether protective immunity is present and is interpreted by a qualified healthcare provider.
What this test measures
Tetanus and diphtheria are caused by bacteria that produce harmful toxins. Vaccination against both is commonly given together, and the immune system responds by producing antibodies that target the toxins. IgG antibodies are the type measured in the blood, and their level helps indicate whether protection is likely present.
A single serum sample is collected by a routine blood draw. The laboratory reports separate antibody levels for tetanus and diphtheria, often in international units per milliliter, and compares each with a threshold that is generally considered protective. The combined test shows immunity status for both diseases at once.
Clinicians order this test when vaccination records are missing or unclear, before certain travel, or for occupational requirements. It is a laboratory measure of immunity and does not by itself decide whether a booster is needed. A qualified healthcare provider interprets the result with the person's history.
- Tetanus antitoxin IgG antibodies
- Diphtheria antitoxin IgG antibodies
- Tetanus antibody level in international units per milliliter
- Diphtheria antibody level in international units per milliliter
- Protective threshold comparison for each disease
- Serum IgG level (when ordered)
Why people order this test
- Check immunity to tetanus and diphtheria together
- Assess protection when vaccination records are unclear
- Evaluate immunity before travel
- Meet occupational immunity requirements
- Determine whether revaccination may be needed
How to prepare
No fasting is needed for this blood test. A sample is collected from a vein, usually at the arm. Follow any instructions from the laboratory, and share any available vaccination history with the ordering provider.
Understanding your results
Results are usually reported within one to three business days. The report shows antibody levels for tetanus and diphtheria and whether each is at or above the protective threshold. A qualified healthcare provider interprets the findings and advises on next steps.
Tetanus and Diphtheria Antibody Test by state
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Connecticut
Tetanus and Diphtheria Antibody Test across Connecticut.
Delaware
Tetanus and Diphtheria Antibody Test across Delaware.
Florida
Tetanus and Diphtheria Antibody Test across Florida.
Georgia
Tetanus and Diphtheria Antibody Test across Georgia.
Hawaii
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Idaho
Tetanus and Diphtheria Antibody Test across Idaho.
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Frequently Asked Questions
What does the tetanus and diphtheria immunity test measure?
It measures IgG antibodies against both tetanus and diphtheria to estimate whether protective immunity is present after vaccination.
Why are the two tests combined?
Tetanus and diphtheria vaccines are often given together, so testing both at once gives a complete view of immunity from the same blood sample.
How is the sample collected?
A standard blood draw from a vein provides the serum used for both antibody measurements.
Do I need to fast?
No fasting is required for this test.
What if one result is low?
A low level for one disease may suggest reduced protection. A healthcare provider can discuss whether revaccination is appropriate.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.