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)) The Protein Digestibility Corrected Amino Acid Score is a more modern rating for determining protein quality .Best assessment of quality of protein is by digestible indispensable aminoacid score which is superior to PDCAAS
After 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)) The Protein Digestibility Corrected Amino Acid Score is a more modern rating for determining protein quality , and the current ranking standard used by the FDA.(PDCAAS)