What is the purpose of the D-xylose test?
The D-xylose absorption test measures the level of D-xylose, a type of sugar, in a blood or urine sample. This test is done to help diagnose problems that prevent the small intestine from absorbing nutrients in food. D-xylose is normally easily absorbed by the intestines.
What does a positive D-xylose test mean?
In most cases, the test results are either positive or negative. A positive result means that D-xylose is found in the blood or urine and is therefore being absorbed by the intestines. Normal value ranges may vary slightly among different laboratories.
What is xylose tolerance?
A xylose test checks the level of xylose in both blood and urine. Levels that are lower than normal can mean there is a problem with your body’s ability to absorb nutrients. Other names: xylose tolerance test, xylose absorption test, D-xylose tolerance test, D-xylose absorption test.
In most cases, the test results are either positive or negative. A positive result means that D-xylose is found in the blood or urine and is therefore being absorbed by the intestines. Normal value ranges may vary slightly among different laboratories.
When is D-xylose eliminated from the body?
Blood levels of D-xylose are highest about 2 hours after you drink the D-xylose solution. Almost all of the D-xylose is eliminated from the body in the urine within 5 hours. If the intestines can’t absorb the D-xylose properly, the amount of D-xylose in the blood and urine will be very low.
How long does it take to take D-xylose absorption test?
Your healthcare provider will ask you to drink 8 ounces of water containing 25 grams of D-xylose sugar. Two hours later, they’ll collect a blood sample. You’ll need to give another blood sample after another three hours. After eight hours, you’ll need to give a urine sample.
Can you take aspirin before a D-xylose test?
Medicines such as aspirin and indomethacin can interfere with the results of a D-xylose test. For this reason, your doctor may instruct you to temporarily stop these medicines before the test. Do not eat or drink anything except water for 8 to 12 hours before having this test.