A member asked:

Negative tb skin, but positive blood test, what's wrong?

Q: negative tb skin, but positive blood test, what's wrong?

: False negative Tuberculin skin test (TST). A number of host factors including viral infection, immunosuppression, poor nutrition, recent TB infection, and disseminated TB infection can decrease Tuberculn skin test reactivity. Blood test such as QuantiFeron TB Gold has a higher specificity when tests positive than that of TST.

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Dr. Jay Park answered

False negative Tuberculin skin test (TST). A number of host factors including viral infection, immunosuppression, poor nutrition, recent TB infection, and disseminated TB infection can decrease Tuberculn skin test reactivity. Blood test such as QuantiFeron TB Gold has a higher specificity when tests positive than that of TST.

Answered 6/1/2021

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A member asked:

Negative tb skin, but positive blood test, what's wrong?

A doctor has provided 1 answer

Dr. Jay Park answered

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