Why forearm is the choice for ppd tuberculin trial? why is it intradermally?
why it should be free from lesions and away from veins?
Answers:
The forearm is readily available. Inject into the skin, not lower than it, or it isn't intradermal. If the PPD is injected into an area with skin lesions, how will you be capable of determine whether a change in appearance is a tuberculin reaction or a metamorphose in activity of the skin disease? The reaction to purified protein derivative have been standardized in an intradermal location, because when reactions go off, they are easiest to read in the skin. Can you imagine trying to read a Mantoux test if the PPD be given intramuscularly? Even if it were given subcutaneously, one might not be able to read it. Don't inject into veins, or the tuberculin won't stay where on earth you want it -- it will be carried away in the bloodstream (how do you read the test results there?), so stay away from vein. Source(s): I'm a physician.
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Answers:
The forearm is readily available. Inject into the skin, not lower than it, or it isn't intradermal. If the PPD is injected into an area with skin lesions, how will you be capable of determine whether a change in appearance is a tuberculin reaction or a metamorphose in activity of the skin disease? The reaction to purified protein derivative have been standardized in an intradermal location, because when reactions go off, they are easiest to read in the skin. Can you imagine trying to read a Mantoux test if the PPD be given intramuscularly? Even if it were given subcutaneously, one might not be able to read it. Don't inject into veins, or the tuberculin won't stay where on earth you want it -- it will be carried away in the bloodstream (how do you read the test results there?), so stay away from vein. Source(s): I'm a physician.
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