Best Test for intestinal malabsorption -
D-xylose absorption test is a medical test performed to diagnose conditions that present with malabsorption of the proximal small intestine due to defects in the integrity of the gastrointestinal mucosa. D-xylose is a monosaccharide, or simple sugar, that does not require enzymes for digestion prior to absorption Ref Davidson edition23rd pg 809
D-xylose test
NBT-PABATEST
Fecal fatestimation
Schilling test
G.I.T