The ELISA SYSTEMS® Soy Residue Detection Kit™ is based on the sandwich enzyme-linked immunosorbent assay format. The food sample is first subjected to an extraction procedure and then tested by ELISA for the presence of soy allergens. The assay detects multiple soy proteins and is based on comparison to soy flour protein concentrations. The results may be quantified by comparing the test results against results obtained from protein standards supplied in the kit.