What does the Radioallergosorbent Test (RAST) primarily assess?

The Radioallergosorbent Test (RAST) primarily assesses the presence of IgE antibodies in the blood, which are specifically related to allergic responses. This test measures the immune system's reaction to specific allergens by quantifying the amount of IgE antibodies generated against those allergens. When a person is exposed to an allergen, their immune system may produce IgE antibodies as a defense mechanism, and high levels of these antibodies can indicate an allergy.

This testing is particularly useful for diagnosing various allergies, including those associated with pollen, mold, pet dander, and specific foods. By identifying the specific IgE antibodies in the blood, healthcare providers can determine what substances a patient may be allergic to, allowing for more effective treatment and management strategies.