Xylose Absorption Test (Child)
Specimen Type Describes the specimen type needed for testing
Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.
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
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.
Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.
Serum: 0.5 mL Urine: 3 mL
Mild OK; Gross reject
Warm reject; Cold OK
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
|Serum||Refrigerated (preferred)||7 days|
|Timed Serum||Refrigerated (preferred)||7 days|
|Urine||Refrigerated (preferred)||7 days|