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How can a TB blood test help diagnose tuberculosis?

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Two types can identify a TB infection. You may have them instead of, or in addition to, a TB skin test.

Once you've had your blood test, you don't need another visit. They're a useful option if you've had a negative TB skin test or if you've had the BCG vaccine.

If your blood test is positive, it means you've been infected with TB germs. You'll be given other tests to see if your tuberculosis is active.

From: TB (Tuberculosis) Tests WebMD Medical Reference

SOURCES:

Mayo Clinic: "Tuberculosis - Diagnosis."

CDC: "Testing for TB Infection," "Diagnosis of Tuberculosis Disease,"  "The Difference Between Latent TB Infection and TB Disease."

UpToDate: "Patient education: Tuberculosis (Beyond the Basics)."

National Jewish Health: "Tuberculosis: Diagnosis."

American Lung Association: "Diagnosing and Treating Tuberculosis."

Reviewed by Laura J. Martin on September 15, 2019

SOURCES:

Mayo Clinic: "Tuberculosis - Diagnosis."

CDC: "Testing for TB Infection," "Diagnosis of Tuberculosis Disease,"  "The Difference Between Latent TB Infection and TB Disease."

UpToDate: "Patient education: Tuberculosis (Beyond the Basics)."

National Jewish Health: "Tuberculosis: Diagnosis."

American Lung Association: "Diagnosing and Treating Tuberculosis."

Reviewed by Laura J. Martin on September 15, 2019

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How can a chest X-ray help diagnose tuberculosis?

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