What does RAST mean in MEDICAL

RAST stands for RadioAllergosorbent Test. It is a laboratory test that measures the amount of specific immunoglobulin E (IgE) in the blood, which is released in response to an allergen contact.

RAST works by extracting a sample of an individual's blood and introducing it to different allergens one at a time. A radioactively labeled antibody binds to the IgE molecules that have been produced if an allergy has been triggered, creating a signal which can be picked up when exposed to X-ray film.

Testing via RAST may be appropriate for individuals who exhibit allergy symptoms but have difficulty identifying their triggers through traditional skin tests. Furthermore, this diagnostic testing method can be helpful for those who are unable to tolerate skin testing due to medical conditions such as skin disorders or severe eczema.

Common allergens including dust mites, pet hair, mold spores and certain foods can be identified through radioallergosorbent testing (RAST). Additionally, insect venom from bees and wasps as well as medications may also be tested using this method.

As with any medical procedure involving blood samples, there is always a risk of infection or other complications associated with obtaining or handling these samples; however, these risks are very low when administering a standard RAST test when appropriate safety protocols are followed. Additionally, false positives are possible during testing due to factors such as cross-reactivity between antigens and inherent natural variability between individuals' reactions.