What happens if you go too deep with a TB skin test?

For 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 injection will produce inadequate results if the needle angle is too deep or too shallow.

Why did my TB test hurt?

For a TB test in blood (also called an IGRA test), a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out.

What can cause a false positive PPD test?

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. Infection with nontuberculosis mycobacteria (mycobacteria other than M. tuberculosis)

What happens if TB test does not bubble?

What if I have a negative TB skin test? In most cases, if there is no bump where the testing fluid was placed, you probably are not infected with TB. A doctor or nurse must look at the area to be sure.

Does PPD skin test hurt?

It was quick and didn’t hurt. In two days, I went back to the clinic so the nurse could see the results. It’s important to go back in 2 or 3 days to get your results or you will have to get the test again. A TB skin test will tell you if you have ever had TB germs in your body.

What are the side effects of a PPD shot?

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• Bleeding at the injection site (occurring up to 3 days after the skin test)
• blistering, crusting, or scabbing at the injection site.
• deep, dark purple bruise at the injection site (occurring up to 3 days after the skin test)
• difficult or labored breathing.
• hard lump at the injection site.