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Tuberculosis Control Branch


TB Testing​


TB_Screening ​​

Screening for TB

Before giving you the TB test, your doctor may ask you some questions about your medical history to determine if you are at risk for TB. For more information, please see the 
California Tuberculosis Risk Assessment and Fact Sheet (PDF).


Blood Test

To determine if you have TB germs in your body, your doctor may give you a blood test. The TB blood test is the recommended test for all individuals over the age of two.   

Your doctor will take a blood sample from your arm for testing and you will be able to know your test results within few days.​​ For more information, please see the CDC Testing and Diagnosis webpage.

​​It is normal to feel a little nervous about the test!Nervous_Patient

If you feel nervous about your TB test, here are some helpful steps you can take when you are at the doctor's office: 

  1. Let the nurse know that you feel nervous about the TB test
  2. Ask them if you can lie down on a bed or if they can recline the chair
  3. Shift your focus by having a conversation with your nurse
  4. Once the test is completed, wait a few minutes until you feel comfortable before getting out of the chair.

Understanding Your Test Results​


If your test result is negative, it means you do not have any TB germs in your body.

It is important to know that you may breathe in TB germs at some point in the future. If you travel to a place where TB is common or notice symptoms similar to TB, speak to your doctor immediately.

Postive_test ​​Positive

If your blood test result is positive, it means you have TB germs in your body.

But do not worry because there is medication that can stop the germs from making you and your loved ones sick.

Your doctor may recommend that you get a chest x-ray to make sure you do not have TB disease.


For more information, please see the CDC Diagnosing Latent TB Infection and Disease webpage.

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