D-Xylose Absorption Test
How It Is Done continued...
Next you will drink a D-xylose solution. For
adults, a blood sample is usually taken 2 hours after drinking the solution.
For children, a blood sample may be taken 1 hour after drinking the solution.
Another blood sample may be drawn 5 hours after drinking the solution.
You will need to collect all of the urine you produce for 5 hours after
drinking the sugar solution. Sometimes urine is collected for 24 hours after
drinking the sugar solution.
The health professional taking a sample
of your blood will:
- Wrap an elastic band around your upper arm to
stop the flow of blood. This makes the veins below the band larger so it is
easier to put a needle into the vein.
- Clean the needle site with
- Put the needle into the vein. More than one needle stick
may be needed.
- Attach a tube to the needle to fill it with
- Remove the band from your arm when enough blood is
- Put a gauze pad or cotton ball over the needle site as
the needle is removed.
- Put pressure on the site and then put on a
- You start collecting your urine in the
morning. When you first get up, empty your bladder, but do not save this urine.
Write down the time that you urinated to mark the beginning of your 5-hour
- For the next 5 hours, collect all your urine.
Your doctor or lab will usually provide you with a large container that holds
about 1 gal (4 L). The
container has a small amount of preservative in it. Urinate into a small, clean
container and then pour the urine into the large container. Do not touch the
inside of the container with your fingers.
- Keep the large container
in the refrigerator during the collection period.
- Empty your
bladder for the final time at or just before the end of the 5-hour period. Add
this urine to the large container and record the time.
- Do not get
toilet paper, pubic hair, stool (feces), menstrual blood, or other foreign
matter in the urine sample.
You will not be allowed to eat until the test is