![]() In some situations, you may need to have another TB skin test later. A negative TB skin test usually means that you don’t have TB. The test is “negative” if there is no bump (or only a very small bump) at the spot where the fluid was injected. tuberculosis) What if my TB test is red but no bump? ![]() Infection with nontuberculosis mycobacteria (mycobacteria other than M. The causes of these false-positive reactions may include, but are not limited to, the following: Previous TB vaccination with the bacille Calmette-Guérin (BCG) vaccine. What causes a false positive TB blood test? ![]() The injection will produce inadequate results if the needle angle is too deep or too shallow. What happens if TB skin test is injected too deep?įor an intradermal injection, the needle bevel is advanced through the epidermis, the superficial layer of skin, approximately 3 mm so that the entire bevel is covered and lies just under the skin. The size of the firm bump (not the red area) is measured 2 to 3 days after the test to find out 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 haven’t been infected with TB bacteria. If there is a bump, it will go away in a few weeks. Your health care provider will measure the size of the reaction. If you have a reaction to the test, it will look like a raised bump. Your health care provider MUST check your arm 2 or 3 days after the TB skin test, even if your arm looks OK to you. False negative: This can happen when a person is infected with the bacteria.Īn incorrectly placed or interpreted TST can contribute to a delay in identifying an index case, which could lead to an outbreak of tuberculosis either in the local community or on a greater scale. It is also possible for the test to read positive falsely if it is not administered correctly, or if the person is infected with bacteria similar to TB.
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