The health care provider will draw your blood and send it to a laboratory for analysis and results. You can get a TB blood test at the health department or at your doctor’s office. Food and Drug Administration and are available in the United States: Two TB blood tests are approved by the U.S. TB blood tests use a blood sample to find out if you are infected with TB germs. Generally, it is not recommended to use both a TB skin test and a TB blood test to test the same person. Health care providers are encouraged to use newer TB blood tests to screen for TB infection. Factors in selecting which test to use include the reason for testing, test availability, and cost. Your health care provider should choose which TB test to use. There are two types of tests for TB infection: the TB blood test and the TB skin test. Most people with TB disease will need to take TB medicine for at least 6 months to be cured. After taking TB medicine for several weeks, a doctor will be able to tell TB patients when they are no longer able to spread TB germs to others. People with TB disease need to take several medicines when they start treatment. This includes family members, friends, coworkers, or schoolmates. People with TB disease are most likely to spread it to people they spend time with every day. People with TB in other parts of their bodies, such as the kidneys or spine, are usually not infectious. People with TB disease in the lungs or throat can be infectious, meaning that they can pass TB germs to their family, friends, and others around them. Treating latent TB infection (LTBI) is effective in preventing TB disease. Other people have latent TB infection and may get sick years later, when their immune system becomes weak for another reason. Some people develop TB disease soon after becoming infected (within weeks) before their immune system can fight the TB germs. The TB germs attack the body, and if this occurs in the lungs, the TB germs can create a hole in the lung. If the immune system can’t stop TB germs from growing, the TB germs begin to multiply in the body and cause TB disease.
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