Immunoassays are a type of laboratory test that are used to measure the presence and concentration of a specific substance in a sample. These tests are often used in medical and research settings to detect and measure various molecules, such as hormones, proteins, and antibodies.

One of the main advantages of immunoassays is their high sensitivity and specificity. This means that they are able to detect very small amounts of a substance and can specifically target a specific molecule, reducing the chance of false positives.