Test library
Immunization Titer Testing
Immunity Detection and Titer Testing measures antibody levels that reflect protection from past infection or vaccination. It is commonly used when schools, employers, or clinicians ask for documented evidence of immunity.
Order Immunity Detection & Titer Testing
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Immunity Detection & Titer Testing- Typical turnaround
- 1-3 business days
- Starting price
- From $119
- Results
- Confidential, online
Quick answer
Immunity Detection and Titer Testing is a group of blood tests that measure antibodies produced after infection or vaccination. A titer shows how much antibody is present for a specific disease, and providers use that information to judge whether a person is likely to be protected. Titer testing is often chosen for school entry, healthcare employment, travel planning, and clinical evaluations, and the panel can be tailored to the diseases that matter for a given situation.
What this test measures
Antibodies are proteins the immune system makes after an infection or a vaccine. For many diseases, a high enough antibody level suggests that the immune system has learned to recognize the germ, although protection is not perfectly predicted by any single number. Titer testing translates that antibody level into a report a school, employer, or clinician can review.
The panel usually draws one blood sample and tests for IgG antibodies against several diseases, which may include measles, mumps, rubella, varicella, hepatitis A, hepatitis B, tetanus, diphtheria, and polio. Results may be reported as positive or negative against a threshold, or as a numeric value with a reference range. The specific diseases tested depend on the reason for testing.
People often order titers to prove immunity for school or work requirements, before travel, during pregnancy, or after a vaccination series to see whether the body responded. A negative or low titer does not always mean there is no protection, because the immune system also relies on memory cells. A qualified healthcare provider can explain what a result means for the person.
- Measles (rubeola) IgG antibodies
- Mumps IgG antibodies
- Rubella IgG antibodies
- Varicella-zoster IgG antibodies
- Hepatitis B surface antibody (anti-HBs)
- Hepatitis A IgG antibodies
- Tetanus and diphtheria antibody levels
- Polio antibody titers when included
Why people order this test
- Document immunity for school or employment requirements
- Check antibody levels after a vaccination series
- Assess immunity before travel or during pregnancy planning
- Support occupational health screening for healthcare workers
- Clarify whether past infection left measurable antibodies
- Provide information for a clinical immune status assessment
How to prepare
No fasting is required for titer testing. Follow the collection instructions provided by the laboratory, and have any vaccination records or medication information available if the testing provider asks for them.
Understanding your results
Results are usually available within one to three business days. Each disease is reported separately, often as immune or not immune based on a laboratory threshold. A qualified healthcare provider should interpret the panel and discuss whether any follow-up is appropriate.
Immunization Titer Testing by state
Alabama
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Alaska
Immunization Titer Testing across Alaska.
Arizona
Immunization Titer Testing across Arizona.
Arkansas
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California
Immunization Titer Testing across California.
Colorado
Immunization Titer Testing across Colorado.
Connecticut
Immunization Titer Testing across Connecticut.
Delaware
Immunization Titer Testing across Delaware.
Florida
Immunization Titer Testing across Florida.
Georgia
Immunization Titer Testing across Georgia.
Hawaii
Immunization Titer Testing across Hawaii.
Idaho
Immunization Titer Testing across Idaho.
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Frequently Asked Questions
What is a titer test?
A titer measures the level of antibodies against a specific disease in the blood. It is used to estimate whether a person has immunity from past infection or vaccination.
Can I be protected even if my titer is low?
Yes. Antibody levels can decline while immune memory remains. For some diseases, protection persists even when the measured antibody level is low, so results are interpreted in context.
How long does immunity from vaccination last?
It varies by disease and by person. Some vaccines provide long-lasting protection, while others need boosters to keep antibody levels high.
Which diseases can be checked?
Common titer tests cover measles, mumps, rubella, varicella, hepatitis A, hepatitis B, tetanus, diphtheria, and polio. The panel is selected based on the requirement or clinical question.
Do I need a referral for titer testing?
Many titer tests can be ordered directly, while some workplaces or programs require a clinician order. The testing service can explain what applies to the panel being requested.
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.