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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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©2013 UpToDate ® Print Email Five perspectives on body composition In this figure, the human body is classified into increasingly general categories, proceeding from the atomic level through molecular, cellular, tissue-system, and whole body. Each perspective is characterized by a set of unique components, which define its measurement parameters. ECS: extracellular solids; ECF: extracellular fluid. Adapted from: Wang Z, Pierson RN, Heymsfield SB. The five-level model: a new approach to organizing body-composition research. Am J Clin Nutr 1992; 56:19.