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Ratio of extracellular mass (ECM) to body cell mass (BCM). A lower value indicates a higher ratio of living to inactive mass, is desirable. Normal values are near 1.0 (a 50/50 distribution)

The ratio of extracellular mass to body cell mass.   A low value is desirable and indicated a high ration of the body cell (living) mass to extracellular (non-living) mass.  Normal values are typically near 1.0 indicating a 50/50 distribution of body cell mass and extracellular mass. It is ideal to have values close to one or below since BCM measures metabolically active tissue a lower ratio indicates higher metabolically active tissue than non-metabolically active tissue and is therefore a useful tool to monitor the metabolism of the body over time.