Lab test

Tetanus & Diphtheria IgG Immunity Test - Titer Testing

A tetanus and diphtheria titer test checks the blood for antibodies against the toxins produced by the tetanus and diphtheria bacteria.

Typical price

From $149

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A tetanus and diphtheria titer test checks the blood for antibodies against the toxins produced by the tetanus and diphtheria bacteria. It helps show whether a person has protective antibody levels from prior vaccination or, less commonly, past infection. People may order it when their vaccination history is unclear, when a booster decision is being considered, or for documentation purposes. The test uses a blood sample and reports each antibody separately. A healthcare provider interprets the levels to help judge whether protection is likely.

• Tetanus IgG antibody (antitetanus toxoid) Antibodies against tetanus toxin that generally reflect protection from vaccination.
• Diphtheria IgG antibody (antidiphtheria toxoid) Antibodies against diphtheria toxin that generally reflect protection from vaccination.

• People whose tetanus or diphtheria vaccination history is uncertain
• Individuals considering whether a booster dose is needed
• People who need documentation of immunity
• Those with a possible wound or exposure concern who want to check status
• Individuals whose healthcare provider wants to confirm antibody levels

• 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 any medications that affect the immune system

Each antibody is reported separately. A protective level of tetanus or diphtheria IgG 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 tetanus and diphtheria levels suggest you are protected. Discuss results with a healthcare provider before making any decisions.

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