Titer Testing: Blood Tests to Verify Immunity & Vaccination Status

A titer test measures the concentration of specific antibodies in your blood, proteins your immune system produced in response to a past vaccination or infection. Quantitative results show whether your levels fall in a range associated with protection against diseases like measles, mumps, rubella, hepatitis A and B, varicella, tetanus, and diphtheria.

Yes, these panels can be ordered online directly through the partner's site, with the blood draw completed at a local lab, and no doctor's appointment or referral is required. Results are delivered to you, and any low or unexpected values are worth reviewing with your own physician.

MMR titers are the most commonly requested, and healthcare employers and nursing or medical programs often add hepatitis B, varicella, and TB screening. The partner page notes these tests are routinely ordered to meet school, employment, or travel requirements, so check your institution's specific list before ordering.

Not on their own, titer results show whether your antibody levels fall in a range associated with protection, and your doctor uses that data alongside your vaccination history and exposure risk to decide whether a booster is appropriate. View a low result as a conversation starter with your clinician, not a medical conclusion.

The Varicella Titer Test documents antibodies from past chickenpox infection but is not considered reliable for confirming immunity that came from vaccination, while the Varicella Immunity Screen detects immunity from both natural infection and vaccination. If you were vaccinated rather than infected, the Immunity Screen is the better choice for documentation.

No, direct-to-consumer lab testing is restricted or prohibited in New York, New Jersey, and Rhode Island, so residents of those states may be blocked at the partner's checkout. Most other US states are served through the partner's network of local draw locations.