Immuno tubes are designed for all solid and liquid phase binding assay applications, including thyroid-stimulating hormone or other hormone determinations, ELISA, IRMA, ILMA, and RIA. Tubes are available in both round- and star-shaped bottom designs. Star-shaped fins increase the surface area and aid in adsorption and mixing efficiency. These tubes facilitate greater sensitivity and shorter incubation times than other immunotubes. Multiple treated surfaces are available for these tubes, which are made of polystyrene, polyethylene, or standard glass.