What is one use of the intradermal injection technique?

The intradermal injection technique is primarily used for screening for tuberculosis. This method involves injecting a small amount of tuberculin purified protein derivative (PPD) into the dermis, which is the layer just beneath the outer skin. The response to the injection is observed after 48 to 72 hours. A localized reaction, indicated by swelling and redness, suggests that the person has been exposed to the tuberculosis bacteria, which is crucial for diagnosis. This method is favored for its ability to provide a localized immune response that can be easily assessed.

In contrast, administering vaccinations typically requires different techniques such as intramuscular or subcutaneous injections to ensure adequate absorption and immune response. Drawing blood samples generally uses venipuncture, which is unrelated to intradermal injection, and providing hormone therapy is usually done via intramuscular or subcutaneous routes. Each of these options serves specific purposes, highlighting the unique application of the intradermal technique in tuberculosis screening.