Friday, August 20, 2010

Tuberculin Skin Test For Tuberculosis



What is a skin test?

tuberculin skin test (also known as the tuberculin skin test or PPD Mantoux) test can determine if a person has developed an immune response to bacteria that cause tuberculosis (TB).
The incubation period is two to 12 weeks is usually required after exposure to Mycobacterium tuberculosis PPD test positive.

How to administer TB skin tests?

Recommended standards for tuberculin test, known as the Mantoux test, is administered by injecting 0.1 ml volumes containing 5 TU (tuberculin units) PPD. PPD is injected just under the skin using a very small needle. Discreet, the elevation of pale skin (wheal) 6 to 10 mm is produced. This amount is generally rapidly absorbed.

What is a reading test TB skin?
"Read", a skin test for detecting elevated responses of the skin, hardening. Sclerosis is a key element to detect, not redness. Skin tests should be read in 48 or 72 hours after the test. Reading tests 48 hours before or after 72 hours are not accepted.

The diameter of induration should be measured for the palpable, raised, hardened around the injection site. Again, the redness is not measured.
tuberculin reaction is classified as positive according to the diameter of induration. The screening test, induration greater than or equal to 15 mm is considered a positive skin test. If you have personal contact with someone with active TB, 10 mm induration is considered a positive skin test. Induration of less than 2 mm (0-2mm) as a skin test negative.

The person who received the BCG vaccine (given in some countries but not in the U.S.) against tuberculosis may also have a positive skin test reaction of tuberculosis, although not always so. positive response, which is no vaccine can persist for years. Persons who were vaccinated after the first year of life or who have more than one dose of vaccine are more likely to have a lasting positive results than those who were vaccinated in infancy.

via web.njcu.edu

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