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This test is usually done on the arm. A small needle is used to put some testing material, called tuberculin, under the skin. In two or three days, a health worker will check to see if there is a reaction to the test. The test is "positive" if a bump about the size of a pencil eraser or bigger appears on your arm.

This test is usually done on the arm. A small needle is used to put some testing material, called tuberculin, under the skin. In two or three days, a health worker will check to see if there is a reaction to the test. The test is "positive" if a bump about the size of a pencil eraser or bigger appears on your arm.

You may need a test that uses a needle to inject a small amount of allergen extract just into the skin on your arm (intradermal test). The injection site is examined after about 15 minutes for signs of an allergic reaction. Your doctor may recommend this test to check for an allergy to insect venom or .

You may need a test that uses a needle to inject a small amount of allergen extract just into the skin on your arm (intradermal test). The injection site is examined after about 15 minutes for signs of an allergic reaction. Your doctor may recommend this test to check for an allergy to insect venom or .

1:54 2:29 Reading a TB Skin Test - YouTube YouTube Start of suggested clip End of suggested clip But there is no induration. This is a very large reaction with blistering swelling and redness makeMoreBut there is no induration. This is a very large reaction with blistering swelling and redness make sure to record blistering. Even if no induration is present.

1:54 2:29 Reading a TB Skin Test - YouTube YouTube Start of suggested clip End of suggested clip But there is no induration. This is a very large reaction with blistering swelling and redness makeMoreBut there is no induration. This is a very large reaction with blistering swelling and redness make sure to record blistering. Even if no induration is present.

At time of reading: Name and signature of person reading test. Date and time test read. Exact number of mm of induration (if no induration, document "0" mm) Interpretation of reading (i.e., positive or negative, based on individual's risk factors)

At time of reading: Name and signature of person reading test. Date and time test read. Exact number of mm of induration (if no induration, document "0" mm) Interpretation of reading (i.e., positive or negative, based on individual's risk factors)

A positive TB skin test will look like a firm, red bump. Your provider will measure the size of the firmness of the bump (induration). Your provider considers your particular risk factors to determine the results of your test.

A positive TB skin test will look like a firm, red bump. Your provider will measure the size of the firmness of the bump (induration). Your provider considers your particular risk factors to determine the results of your test.

Do not record as “positive” or “negative”. Only record measurement in millimetres. If no induration, record as 0 mm.

Normal Results A negative reaction usually means you have never been infected with the bacteria that cause TB. With a negative reaction, the skin where you received the PPD test is not swollen, or the swelling is very small. This measurement is different for children, people with HIV, and other high-risk groups.

Do not record as “positive” or “negative”. Only record measurement in millimetres. If no induration, record as 0 mm.

If you have an Mtb infection, the skin around the injection site should start to swell and harden within 48 to 72 hours . This bump, or induration, may also change color. But the induration's size, not the color, will determine your results. An induration of less than 5 millimeters (mm) is a negative result.

1:37 2:29 Reading a TB Skin Test - YouTube YouTube Start of suggested clip End of suggested clip But there is no induration. This is a very large reaction with blistering swelling and redness makeMoreBut there is no induration. This is a very large reaction with blistering swelling and redness make sure to record blistering. Even if no induration is present.

Normal Results A negative reaction usually means you have never been infected with the bacteria that cause TB. With a negative reaction, the skin where you received the PPD test is not swollen, or the swelling is very small. This measurement is different for children, people with HIV, and other high-risk groups.

A positive result means you reacted to a substance. Your provider will see a red, raised area called a wheal. Often, a positive result means the symptoms you're having are due to exposure to that substance. A stronger response means you are likely more sensitive to the substance.

If you have an Mtb infection, the skin around the injection site should start to swell and harden within 48 to 72 hours . This bump, or induration, may also change color. But the induration's size, not the color, will determine your results. An induration of less than 5 millimeters (mm) is a negative result.

Induration of 15 mm or more is considered positive in the following cases: Healthy individuals older than four years of age with a low likelihood of TB infection[14]

Induration of 15 mm or more is considered positive in the following cases: Healthy individuals older than four years of age with a low likelihood of TB infection[14]

1:37 2:29 Reading a TB Skin Test - YouTube YouTube Start of suggested clip End of suggested clip But there is no induration. This is a very large reaction with blistering swelling and redness makeMoreBut there is no induration. This is a very large reaction with blistering swelling and redness make sure to record blistering. Even if no induration is present.

A positive result means you reacted to a substance. Your provider will see a red, raised area called a wheal. Often, a positive result means the symptoms you're having are due to exposure to that substance. A stronger response means you are likely more sensitive to the substance.

Induration of 15 mm or more is considered positive in the following cases: Healthy individuals older than four years of age with a low likelihood of TB infection[14]