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Larger reactions (10 mm of swelling or more) are a positive result in people who:have had a negative PPD skin test in the past two yearshave diabetes, kidney failure, or other conditions that increase their TB riskare healthcare workersare intravenous drug usersare immigrants who’ve come from a country that’s had a high TB rate in the past five yearsare under age 4More items...What does a positive PPD look like?
Positive PPD test: A positive TB test should look like hard, raised bump with size >5to15 mm depending of the risk category you are in. It should be read in between 4... Read More. 4.9k views Answered >2 years ago. Thank.What happens if PPD is positive?
What happens if PPD is positive? The most commonly used skin test to check for TB is the PPD — purified protein derivative. If you have a positive PPD, it means you have been exposed to a person who has tuberculosis and you are now infected with the bacteria (mycobacterium tuberculosis) that causes the disease.What does a negative PPD test look like?
When you get a negative reaction after the test, it means that you haven’t been infected by the TB-causing bacteria at any point in your life. If the test turns out negative, you will experience a very small swelling or none at all. Measurements vary for children, HIV victims and other high-risk groups. The PPD skin test is not foolproof.