A review, with 8 references, is given on calibration of small mol. immunoassays for quant. analyses.The appeal of immunoassays was their ability to provide precise and accurate quant. results for a specific analyte at a low cost per test.This quant. capability was the motivation for anal. chemists to evaluate the technique for use with environmental samples.While some regulators have initially viewed immunoassays as a qual. method, more recently they have expressed interest in extending the application of immunoassay beyond screening results to quant. analyses.Although many of the principles underlying qual. and quant. techniques are similar, qual. evaluation of data, particularly when applied to the detection of complex mixtures, is sufficiently complex to deserve sep. treatment.A general approach to important considerations will be given along with a set of recommendations for the analyst using immunochem. methods.