Elemental analysis is a fundamental and frequently used analytic technique for many academic, medical, and industrial laboratories. The CHORI Elemental Analysis Facility (CHORI-EAF) provides elemental quantitation and support services (sample preparation, metal extraction, dissolved solids measurement, analytic consultation, and technical writing assistance) in support of a wide range of clinical and biomedical research projects. The CHORI-EAF services are available on a fee-for-use basis for both intramural and extramural researchers at highly competitive cost.