 This dual-tracer method has been used to assess the ability of an individual to dispose of an oral glucose load, and accurately fractionates the appearance of ingested glucose in plasma Ra meal, EGP, and peripheral glucose disposal Rd in this setting 41-42. The 6,6-2H2glucose and U-13Cglucose are stable-isotope tracers and are different from radioactive-isotope tracers in that they do not emit radiation. 