Protein digestibility corrected amino acid score

Protein digestibility-corrected amino acid score (PDCAAS) is a method of evaluating the quality of a protein based on both the amino acid requirements of humans and their ability to digest it.

The PDCAAS rating was recommended by Food and Agriculture Organization of the United Nations/World Health Organization (FAO/WHO) the in 1989 (report published in 1991). It was adopted by the US FDA in 1993 as "the preferred 'best'" method to determine protein quality.

In 2013, FAO proposed changing to Digestible Indispensable Amino Acid Score.

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