Lab test
Diphtheria Antibody Test - Immunity Testing
A diphtheria antibody test checks the blood for antibodies against the diphtheria toxin, which are produced after vaccination or infection.
- Typical price
- From $129
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
A diphtheria antibody test checks the blood for antibodies against the diphtheria toxin, which are produced after vaccination or infection. It helps assess whether a person has protective immunity. People may order it when their vaccination history is unclear, when a booster decision is being made, or for documentation purposes. The test uses a blood sample. A healthcare provider interprets the antibody level to help judge whether immunity is likely and whether revaccination might be considered.
What this test measures
- Diphtheria IgG antibody (antidiphtheria toxoid) Antibodies against diphtheria toxin that generally reflect protection from vaccination.
Who this test may be right for
- People whose diphtheria vaccination history is uncertain
- Individuals considering whether a booster dose is needed
- People who need documentation of diphtheria immunity
- Those whose healthcare provider wants to confirm antibody levels
- People with a possible exposure concern who want to check status
Before your visit
- No fasting is required for this blood test
- A standard blood draw is used to collect the sample
- Bring any vaccination records you have
- Tell the lab about medications that affect the immune system
Understanding your results
A protective diphtheria IgG level generally suggests adequate immunity, while a low level may indicate that protection is uncertain and that a booster could be considered. Antibody levels can decline over time, so results are interpreted with vaccination history. A healthcare provider can explain whether your diphtheria antibody level suggests you are protected. Discuss your diphtheria immunity result with a healthcare provider before making any decisions.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What does the diphtheria antibody test measure?
It measures IgG antibodies against the diphtheria toxoid to help determine whether a person has protective immunity from vaccination.
What if my diphtheria IgG level is low?
A low diphtheria IgG level may mean protection is uncertain; a healthcare provider can review your vaccination history and discuss whether a booster is appropriate.
Does diphtheria immunity testing require fasting?
No. The diphtheria antibody test is a blood draw and does not require fasting.
What does the Diphtheria Antibody Test - Immunity Testing measure?
This blood test is used to assess if an individual was vaccinated for diphtheria, and/or the amount of antibody response to the diphtheria toxoid vaccine.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Diphtheria Antibody Test - Immunity Testing results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
Laboratory services are provided by independent, CLIA-certified testing partners. Availability, pricing, and turnaround times can vary by location and are confirmed at checkout.