Assay system in gel material.

摘要

A gel body (12, 12A) is provided with a reagent system which interacts with a sample portion (39) which diffuses into the gel (12, 12A) to change the transmissive properties of the gel (12, 12A). The gel body (12, 12A) is used in an assay for various analytes, and preferably has a shape and index of refraction whereby a beam of light (21, 21A) can be transmitted through the gel body (12, 12A) by total internal reflectance.