Assay services refer to a range of services that are provided to measure or test the biological activity or properties of a substance or sample. The term “assay” can refer to a wide range of different tests or measurements, and assay services can be provided for many different types of samples, including biological samples, environmental samples, and industrial products.

Some examples of assay services that are commonly provided include:

1. Bioassays: Bioassays are tests that are used to measure the biological activity or potency of a substance, such as a drug or a hormone. Bioassay services can be used to determine the potency of a drug or to screen for the activity of novel compounds.
2. Cell-based assays: Cell-based assays are tests that are used to measure the effect of a substance on living cells. These assays can be used to screen for the activity of drugs or to test the toxicity of industrial chemicals.
3. Enzyme assays: Enzyme assays are tests that are used to measure the activity of enzymes in a sample. These assays can be used to screen for inhibitors or activators of enzymes or to study the kinetics of enzyme reactions.
4. Immunoassays: Immunoassays are tests that are used to measure the presence or quantity of a specific protein or other biomolecule in a sample. These assays can be used to detect disease biomarkers or to measure the concentration of a therapeutic protein in a patient sample.
5. Toxicology assays: Toxicology assays are tests that are used to evaluate the toxicity of a substance in a living organism. These assays can be used to assess the safety of new drugs or chemicals.

Assay services can be provided by specialized laboratories or contract research organizations (CROs) that have expertise in performing specific types of assays. These services can be valuable for drug discovery, environmental testing, and product development. It is important to carefully select the appropriate assay service and provider based on the specific needs and requirements of the project.