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Immunoassays detect the presence of macromolecules in a sample through the use of antibodies. Immunoassay kits rely on the ability of an antibody to recognize and bind a specific macromolecule, typically a protein, and generate a measurable signal that corresponds to the binding. Assay kits are commonly used to measure the concentration of proteins in biological samples such as urine, serum, or cell extracts. The assays may come in various formats including colorimetric, fluorescent and chemiluminescent. Alfa Aesar offers several colorimetric immunoassay kits for a variety of proteins and small molecules. Our immunoassay kits are simple, reproducible and highly specific tools for accurate determination in biological samples.