Before revision: One formula for NPU is: NPU = {0.16 × (24 hour protein intake in grams)} - {(24 hour urinary urea nitrogen) + 2} - {0.1 × (ideal body weight in kilograms)} / {0.16 × (24 hour protein intake in grams)} NPU values can be either true or apparent, depending on whether the loss of endogenous nitrogen is taken into account or not; this is critical for precisely determining the efficiency of dietary protein utilization and the quality of different dietary protein sources.
After revision: apparentOne formula for NPU is: NPU = {0.16 × (24 hour protein intake in grams)} - {(24 hour urinary urea nitrogen) + 2} - {0.1 × (ideal body weight in kilograms)} / {0.16 × (24 hour protein intake in grams)} NPU values can be either true or apparent, depending on whether the loss of endogenous nitrogen is taken into account or not; this is critical for precisely determining the efficiency of dietary protein utilization and the quality of different dietary protein sources.