TB Skin Test

TB Skin Test (Mantoux Test)

  • The TB skin test, also known as the Mantoux test, tells if your body has been exposed to the TB germ.
  • The doctor will inject a small amount of fluid just under the skin of the left forearm.
  •  You will see a little bubble or blister appear right away at the injection site. This is normal and it will soon disappear.
  • After 2-3 days, you will be asked to see the doctor to have the area checked and the reaction measured.
  • If there is no reaction after 2-3 days, you most probably have not been exposed to the TB germ.
  • If there is a reaction, some redness and a small bump will appear on the arm.

A measurement of 10 millimeters or more is “positive”, and means you may have the TB germ in your body. At that point, the doctor will request additional information and tests, including chest x-ray and the collection of sputum samples. When results are abnormal, you will be referred to an infectious decease specialist. To book an appointment click here