Short answer: A TB blood test such as QuantiFERON or IGRA uses one blood draw. A TB skin test, also called PPD, requires placement and then a return visit for reading. Some schools accept either, while others require a specific type.

Quick answer

A TB blood test such as QuantiFERON or IGRA uses one blood draw. A TB skin test, also called PPD, requires placement and then a return visit for reading. Some schools accept either, while others require a specific type.

How to choose

• If your form says QuantiFERON, IGRA, or TB blood test, choose TB blood testing
• If your form says PPD, TB skin test, or 2-step TB, choose the skin test option
• If your form gives a choice, TB blood testing can be more convenient because it does not require a return reading

Recommended SchoolTiters links

• TB Blood Test - QuantiFERON Gold
• TB Skin Test
• 2-Step TB Skin Test
• Immunity Panel + TB Blood Test

FAQ

Is QuantiFERON a TB blood test?

Yes. QuantiFERON is an IGRA blood test used for TB screening.

Does a TB skin test require two visits?

Yes. A TB skin test requires placement and a return visit for reading.

What is a 2-step TB test?

A 2-step TB test is two separate TB skin test placements/readings, often required by certain schools or employers.