title: Alternative adherence marker schemes.
abstract: Various possible adherence markers are mentioned, including inert particulate matter, soluble and insoluble dyes, polymer attached dyes, spin-labeled substances, and radioactive and stable isotope tracers. Methods for detection might include nuclear magnetic resonance (NMR), electron spin resonance (ESR), x-ray, gas chromatography, and simple fluorescence or absorption. Emphasis is placed on systems involving safety, reliability, and redundancy. No clear-cut superiority of any method is apparent.
mesh_terms: D006801:Humans; D007408:Intestinal Absorption; D013058:Mass Spectrometry; D010349:Patient Compliance; D014815:Vitamins / Q000494:pharmacology
chemical_list: D014815:Vitamins