Test ID: FXAT    
Xylose Absorption Test (Child)

SUBMIT ALL OF THE FOLLOWING (Read ALL collection

information prior to start of test and collection of specimens.)

Serum-Required: Fasting serum and One hour specimen

Collect blood in plain, red-top tube(s), allow to clot completely

at room temperature. Separate from cells ASAP and label tube

with "Fasting serum" or "One-hour serum" as appropriate. Ship

specimens refrigerate.

Urine

Collect all urine for five hours. Measure and record the volume,

mix well and remove a 5 mL aliquot, label sample "Five-hour

urine". Ship specimen refrigerate.

REQUIRED COLLECTION INSTRUCTIONS - Read ALL

collection information prior to start of test.

*  Children are defined as less than 17 years old for the purposes

    of this test.

*  Xylose dose must be obtained from a pharmacy, 0.5 g xylose

    per kilogram of body weight up to 25g.

*  Patient should fast for eight hours (4 hours min) prior to start of test.

*  Patient should empty bladder prior to start of test. (do not collect)

*  Prior to xylose administration, , collect fasting serum sample, label tube

    clearly "Fasting Serum"

*  Give xylose in water, (5 mL of water per 0.5 g of xylose up to

    250 mL water). Encourage the patient to drink additional water

    following xylose dose. The patient may have water as desired,

    but no other food or fluids. The patient should rest in a chair or

    on a bed until completion of test. Mild diarrhea is common

    following xylose ingestion.

* Collect the second serum sample one hour after giving the

    xylose dose. Label tube clearly "One-hour Serum".

*  Immediately following xylose dose, COLLECT ALL URINE FOR THE

    NEXT  FIVE HOURS.  Measure and record the volume, mix

    well and remove a 5 mL aliquot. Label sample "Five-hour

    Urine", record total volume and the xylose dose given.

    NOTE: if unable to collect peds urine, testing will be ran with

    disclaimer, provided both serum specimens are received.