What is a ''RAST'' test?

A RAST (Radioallergosorbent test) is a laboratory test using a blood sample to measure the presence or absence of IgE antibodies, usually to food or airborne allergens. ''RAST'' is an old terminology for a laboratory technique no longer sued, but it has stuck. ''Specific IgE test'' is the same thing. Here is some more information: RCPA - specific IgE