 The raw soy beans, with tough cell walls protecting the protein, have a far lower digestibility than the purified, unprotected, soy bean protein extract.As a foodstuff far more protein can be absorbed from the extract than the raw beans, however the BV will be the same.The exclusion of digestibility is a point of misunderstanding and leads to misrepresentation of the meaning of a high or low BV

BV provides a good measure of the usability of proteins in a diet and also plays a valuable role in detection of some metabolic diseases.