calculated body weight estimate total body water mass 2023-08-11T17:07:21Z CMO:0003942 PMID:37191987 TBW weight This measurement is a calculated/estimated value of the relative mass of total fluid in an organism. The two main fluid compartments are divided by the cell membrane into the extracellular fluid (ECF) and the intracellular fluid (ICF). clinical_measurement_ontology slaulede total body fluid mass total body fluid weight