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After you get a TB shot, what do the results in "mm" mean? If the result is negative, are you supposed to write the results in mm, or only if it is positive?
Question
#12438. Asked by d. (Jun 14 01 10:06 PM)
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l3i7l
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A 'positive' PPD refers to the size of the swelling (induration) that results 48 to 72 hours after PPD material is injected into the skin. Usually, the test is called 'positive' or 'significant' when the induration measures 10 mm or more - about 1/8th of an inch. A significant result means that your immune system is reacting to TB germs located somewhere is your body. It does not mean that you have TB disease or that you are contagious to others. However, a 'positive' PPD does mean you are at increased risk for developing TB disease in the future, anytime during your life - unless adequate preventative treatment is given. http://www.vh.org/Patients/IHB/IntMed/Infectious/TBpositive.html Here's to your good health!
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