Lean Body Mass Calc

Used to identify low muscle mass, sarcopenia, or sarcopenic obesity when BMI is misleading and to guide nutritional or exercise interventions in adults. Supports risk stratification in CVD rehabilitation where lean‑fat ratio predicts outcomes (Circulation 2024 1 [Level III evidence]). Helps detect malnutrition/frailty and monitor therapy in cirrhosis, where objective muscle mass strongly predicts prognosis (Hepatology 2021 2 [Level I evidence]).

Start by recognizing that estimates are approximations: simple anthropometric or BIA‑derived lean body mass can be biased by hydration, fluid shifts, and altered fat distribution. Skinfolds and BIA lack precision for lean mass quantification 1 [Level I evidence]. DXA or CT are more accurate but costly and less feasible, and DEXA‑based endpoints show discrepancies compared with BIA in clinical trials 2 [Level II evidence]. Use results cautiously in athletes, older adults, and patients with fluid retention.