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 (PDCAAS) is a more modern rating for determining protein quality, and the current ranking standard used by the FDA.
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 (PDCAAS) is a more modern rating for determining protein quality, and the current ranking standard used by the FDA.