since intrinsic-factor-bound vitamin b12 ( if-b12 ) absorption is confined to the ileum , as an index of ileal adaptation , we measured whole-body if-58 co b12 absorption in 24 control subjects , in 4 patients after proximal small-bowel resection , and in 9 patients with adult celiac disease ( where mucosal damage is often limited to the proximal intestine and spares the ileum ) .
C0192601
small-bowel resection
C0021853
intestine