Xylose tolerance test; Diarrhea - xylose; Malnutrition - xylose; Sprue - xylose; Celiac - xylose D-xylose absorption is a laboratory test to check how well the intestines absorb a simple sugar (D-xylose). The test helps detect if nutrients are being properly absorbed. The urinary system is made up of the kidneys, ureters, urethra and bladder. The D-xylose tolerance tests measure the intestines' ability to absorb D-xylose, a simple sugar, as an indicator of whether nutrients are being properly absorbed. How the Test is Performed The test requires a blood and urine sample. These tests include:Clean catch urine specimenVenipuncture (blood draw)There are several ways to perform this test. A typical procedure is described below, but make sure you follow the specific instructions you are given.You will be asked to drink 8 ounces (240 ml) of water that contains 5 teaspoons (25 grams) of a sugar called d-xylose. The amount of d-xylose that comes out in your urine over the next 5 hours will be...
