Results of the test depend on your risk for TB.
#Negative tb test skin
Your doctor will consider your chance of having TB when looking at the skin test site. The size of the firm bump (not the red area) is measured 2 to 3 days after the test to determine the result. A firm red bump may mean you have been infected with TB bacteria at some time. Redness alone at the skin test site usually means you have not been infected with TB bacteria. Ī tuberculin skin test is done to see if you have ever had tuberculosis (TB) (infection with Mycobacterium tuberculosis). To help you understand the importance of this test, fill out the medical test information form. Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. Have a skin rash that may make it hard to read the skin test.Have been treated with medicines, such as corticosteroids, that can affect your immune system.The vaccine contains a bacteria called BCG ( bacille Calmette-Guérin) that is closely related to the bacteria that cause TB. Having lived or travelled in a country where TB is common.A job as a health care worker that may cause you to be exposed to people with TB.Have risk factors for TB, which are things that increase your risk.Have had a severe reaction to a tuberculin skin test in the past.Have symptoms of tuberculosis (TB), such as an ongoing cough, night sweats, or unexplained weight loss.
This means that you do not have TB bacteria in your body. However, there is a small chance that you might breathe in TB bacteria in the future.Before having a tuberculin skin test, tell your doctor if you: If you have received a negative test result: It is also worth knowing that before treating you for latent TB they will do some final tests to make absolutely sure you do not have active TB. You will then see a TB doctor or TB nurse who will offer you support and treatment for latent TB. Your GP will refer you to a specialist TB clinic.
This means that you have TB bacteria in your body, but try not to worry because latent TB can be cured with a course of antibiotics. If you have received a positive test result: If this is the case, these tests will be explained to you and you will be asked to give your permission for these tests to be done. These include viruses such as HIV and hepatitis B, which, like TB, can be treated in order to stop them becoming more serious and causing problems in the future. You may be offered tests for other conditions that can be found in someone’s blood (known as blood-borne viruses), before they start causing any obvious illness.
I have been offered other tests with my TB test. If you are not yet registered with a GP you can find out more about accessing NHS services by reading this leaflet or you can find your nearest GP using our GP service finder. You will be told when to expect the results. You will need to return to the test centre between 48-72 hours later for the doctor or nurse to measure and interpret the results.īlood test: A small amount of blood is taken from your arm and sent to a laboratory. If your body has come into contact with TB, the skin becomes raised and red. Skin test: A tiny amount of TB extract is injected under the skin on your forearm. if you currently have any unexplained symptoms.if you have any long-term illnesses, such as HIV.if you were born in, or have strong links to, particular countries.The person taking the test may also ask a number of questions, to help identify your risk of TB:
#Negative tb test professional
The doctor, nurse or other healthcare professional that performs the test will talk you through the test and possible outcomes, answer any questions you may have, and advise when you can expect the results. The test may be taken at your local GP practice, in a specialist TB clinic or occasionally in a local community setting. You may be offered either one of two different tests for latent TB, a TB skin test (known as a TST or Mantoux) or a blood test (known as an IGRA).
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