IRT

IRT may refer to:

  • Immunoreactive trypsinogen, used as a newborn screening test for cystic fibrosis
  • Indiana Repertory Theatre, a theatre in Indianapolis, Indiana
  • Infrared thermography
  • Institut für Rundfunktechnik, the research institute of the public broadcasters of Germany, Austria, and Switzerland
  • Interborough Rapid Transit Company, former operator of a portion of the New York City Subway system
  • Isochronous real time, a computer protocol used for PROFINET IO
  • Item response theory, a theory to interpret data from psychometric tests
  • Ice Road Truckers, a documentary television series on History Channel
    • IRT: Deadliest Roads, a spin-off series of Ice Road Truckers