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The QuantiFERON TB test, also known as a TB blood test, QuantiFERON-TB Gold test, and IGRA test, is a blood test that checks for prior exposure to tuberculosis. This FDA-approved TB blood test is frequently used for tuberculosis screening as an alternative to the TB (PPD) skin test.
The MMR titer is a blood test that checks for immunity to measles, mumps and rubella. Also known as an MMR test, the MMR titer measures IgG antibody blood levels to check if the immune system can protect against an infection from an MMR component.
The hepatitis B titer checks the hepatitis B surface antibody blood level to determine hep B immunity.
The varicella titer is a blood test that checks for immunity to the varicella-zoster virus (VZV). Also known as a chickenpox titer, this varicella test measures IgG antibody levels to show that one's immune system can protect against a varicella infection or shingles.