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Methods| Data on MPI protocols used in clinical practice were collected as part of the International Atomic Energy Agency Nuclear Cardiology Protocols Study (INCAPS), 4 a cross-sectional registry of 7911 patients undergoing MPI in 308 laboratories in 65 countries. Laboratories provided data, including protocols, radiopharmaceuticals, and administered activities, for all studies performed during a 1-week period between March 18 and April 22, 2013. Data analysis was performed from August 18, 2014, to July 16, 2015. We excluded from analysis 1196 patients (339 from the United States) who underwent single-photon emission computed tomographic imaging reflecting myocardial perfusion at rest only, with no stress testing performed; a protocol involving thallium 201, for which information regarding perfusion at rest or myocardial viability may be of interest in addition to findings from stress testing; or positron emis-