Pick a frequency and a segment · or tap the drawing
The measuring currentCells (water inside) in fluid (water outside)Meters: one per segment, laid out like the result sheetThe InBody 580 passes a tiny alternating current (200 µA, too small to feel) between electrodes under your palms and feet, at 5, 50, 250 and 500 kHz, and reads the impedance of each arm, each leg and the trunk: 20 readings in about 30 seconds. Water carries the current and fat resists it.Cell membranes act like tiny capacitors. At low frequency they block the current, which flows round the cells through the water outside them; at higher frequencies more of it passes through the cells too. Comparing the two gives the share of body water outside cells (ECW/TBW; InBody's normal range is 0.360–0.390). Phase angle, read at 50 kHz, reflects how much intact cell membrane the current meets.Resistance grows with length and falls with thickness, so a thin arm reads about 388 Ω at 50 kHz while the trunk, which holds about half the lean mass, reads about 82 Ω. Ohms are example values for an adult woman, not a reference range. The current really alternates thousands of times a second; it's drawn as a steady stream. Your report is read with your clinician.