skin tests

A tuberculin skin test (also called a Mantoux tuberculin test) is done to see if you have ever been exposed to tuberculosis (TB)

The mantoux tuberculin skin test is one way of finding out whether a person is infected with Mycobacterium tuberculosis, a bacteria known for causing Tuberculosis (TB). 



0.1ml of tuberculin purified protein derivative (PPD) will be injected into the inner surface of either forearm. The patient can then return home but should return between 48 and 72 hours. Returning back after 72 hours will result in an invalid test result. 

When the patient returns within 48-72 hours, the skin reaction should be measured in millimeters. The reaction that will occur is called induration (firm swelling). 



Induration of 5 or more millimeters is positive for TB if:

  • HIV positive
  • Recent contact with a person infected with tuberculosis (TB).
  • X-ray findings suggestive of previous TB disease.
  • History of organ transplants
  • Immunosuppressed state


Induration of 10 or more millimeters is positive for TB if:

  • People born in countries where TB disease is common
  • Drugs abuse
  • Mycobacteriology laboratory workers
  • People who live or work in high-risk congregate settings (i.e.: nursing homes, homeless shelters)
  • People with low body weight
  • Children younger than 5 years old
  • Conditions placing them at high risk for TB (i.e.: silicosis, diabetes mellitus, severe kidney disease, etc.) 


Induration of 15 or more millimeters is positive for TB if:  

  • -People with no known risk factors for TB

This test involved administering 0.1ml of PPD into the top layers of skin of the forearm. Skin test should be read 48-72 hours after the injection to determine the presence or absence and the amount of induration (localized swelling).

KKLIU 1643/2021

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