Some people develop rashes from the bandaid tape which can then interfere with the test. Apply pressure with a dry piece of gauze instead. Occasionally, there can be some itching at the site, but try to avoid scratching!
DO not use any creams on the site including Benadryl or Cortisone since they will interfere with the results of your test. You CAN apply a cold compress to the area to alleviate the itching. Some people experience some redness, rash, slight bruising or a small bump at the site.
These reactions are common and do not necessarily mean you have a positive test. There have been reports in the literature of patients reacting to PPD testing. As to the specific question of her getting a PPD test in the future, if the current reaction was felt to be related to the PPD test then future PPD testing must be approached with caution. I am not aware of any "challenge" protocols for TB testing. A small shot of the tuberculosis antigen purified protein derivative, or PPD is put under the top layer of skin.
The fluid makes a little bump wheal under the skin. A circle may be drawn around the test area with a pen. There is a very slight risk of having a severe reaction to the tuberculin skin test, especially if you've had tuberculosis TB. An allergic reaction can cause a lot of swelling and pain at the site. You may have a sore. You cannot get a TB infection from the tuberculin skin test. That's because no live bacteria are used for the test.
Redness alone at the skin test site usually means you haven't been infected with TB bacteria. A firm red bump may mean you have been infected with TB bacteria at some time. The size of the firm bump not the red area is measured 2 to 3 days after the test to find out the result.
Your doctor will consider your chance of having TB when looking at the skin test site. Results of the test depend on your risk for TB. If you are in a high-risk group, a smaller bump is considered a sign of infection. People at low risk for having TB need to have a larger bump to be diagnosed with a TB infection.
This includes people who have HIV, those who have had close recent contact with a person who has active TB, and those who have symptoms or a chest X-ray that shows TB. Other people at high risk for TB include those who take corticosteroid medicines for a long time and people who take biologics. These are used to treat rheumatoid arthritis and Crohn's disease. Have risk factors for TB, which are things that increase your risk.
A job as a health care worker that may cause you to be exposed to people with TB. Having lived or traveled in a country where TB is common. Have been given a TB vaccination. Have been treated with medicines, such as corticosteroids, that can affect your immune system.
Are infected with HIV. Have a skin rash that may make it hard to read the skin test. How It Is Done For a tuberculin skin test, you sit down and turn the inner side of your forearm up. How It Feels You may feel a quick sting or pinch from the needle.
Risks There is a very slight risk of having a severe reaction to the tuberculin skin test, especially if you have had tuberculosis TB. A tuberculin skin test is safe for pregnant or breastfeeding women. After the test Some redness at the skin test site is expected. A strong positive reaction may cause mild pain. Talk to your doctor if you have: A fever. Swelling in your arm. Swollen lymph nodes in your armpit.
Results A tuberculin skin test is done to see if you have ever had tuberculosis TB infection with Mycobacterium tuberculosis. Three levels of risk have been defined: The high-risk group includes people who have HIV, those who have had close recent contact with a person who has an active TB infection, and those who have symptoms or a chest X-ray that shows TB. Moderate-risk group includes people who have recently moved from or traveled in a country with a high rate of TB; those who use illegal drugs by injection intravenous drug users ; people who live in nursing homes; workers in hospitals, nursing homes, schools, and prisons; children younger than 4 years old; children ages 4 to 18 who are exposed to high-risk adults; and homeless people.
Low-risk group includes people who do not have any possible exposure to TB listed in the other risk groups. A positive reaction usually remains visible for about 1 week. Taking medicines that suppress the immune system, such as corticosteroids. Conditions that weaken the immune system, such as HIV infection or cancer. The result also may be affected if a person is severely malnourished.
Some vaccinations for infections, such as measles, mumps, rubella, polio, or chickenpox, given within 6 weeks before the tuberculin test.
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