<unk>  <unk> , sometimes conflated with fat-free<unk> , is a component of body composition. Fat free<unk>  (FFM) is calculated by subtracting body fat weight from total body weight: total body weight is<unk>  plus fat. In equations: :LBM = BW − BF ::Lean body<unk>  equals body weight minus body fat :LBM + BF = BW ::Lean body<unk>  plus body fat equals body weight<unk>  differs from FFM in that cellular membranes are included in<unk>  although this is only a small percent difference in the body's<unk>  (up to 3% in men and 5% in women) The percentage of total body<unk>  that is<unk>  is usually not quoted – it would typically be 60–90%. Instead, the body fat percentage, which is the complement, is computed, and is typically 10–40%. The<unk>  <unk>  has been described as an index superior to total body weight for prescribing proper levels of medications and for assessing metabolic disorders, as body fat is less relevant for metabolism. LBW is used by anesthesiologists to dose certain medications. For example, due to the concern of postoperative opioid-induced ventilatory depression in the obese patient, opioids are best based on<unk>  body weight. The induction dose of propofol should also be based on LBW.
Lean body mass
Body fat percentage
Body composition
Human height
Human body weight
Body adiposity index
Body surface area
Body mass index