Enzyme multiplied immunoassay technique, or EMIT, is a common method for screening urine and blood for drugs, both legal or illicit. First introduced by Syva Company in 1973, it is the first homogeneous immunoassay to be widely used commercially.

CPT Code 87400 : Infectious agent antigen detection by enzyme immunoassay technique, qualitative or semiquantitative, multiple step method; Influenza, A or B, each.

CPT Code 87449 - Infectious agent antigen detection by enzyme immunoassay technique qualitative or semiquantitative; multiple step method, not otherwise specified, each organism

Gerard Griffith has written:

'Enzyme-immunoassay of cortisol'

Antigen Detection