Which type of skin testing provides rapid results and must be supervised by a provider?

Scratch testing is a method used primarily for allergy testing that involves placing allergens on the skin and using a device to scratch the surface. This testing method is designed to elicit an immediate reaction from the immune system, allowing healthcare providers to observe results within a short time frame, typically around 15 to 30 minutes.

The requirement for supervision by a provider is essential because allergic reactions can occur, and having a medical professional present ensures that any adverse effects can be promptly managed. The rapidity of the results allows for quick decision-making regarding patient care, which is crucial in allergy assessments.

In contrast, RAST testing is a specific blood test that measures the presence of IgE antibodies to particular allergens and requires days to process results. Intradermal testing involves injecting allergens into the skin, which can also yield results quickly but is generally considered after scratch testing due to the risk of more severe reactions and usually requires more cautious monitoring. Peak-flow testing assesses lung function and is unrelated to skin testing for allergies.

Thus, scratch testing stands out for its quick result time and the need for healthcare provider supervision during the process.