Test ID: FXAB
Xylose Absorption Test (Adult 25g dose)
Specimen Type 
Describes the specimen type needed for testing
Timed Serum
Urine
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 Two-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 "Two-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.
* 25 g Xylose dose must be obtained from a pharmacy.
* Patient should fast for eight hours 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 adults 25 g D-xylose in 250 mL water. Encourage
patient to drink an additional 250 mL water following xylose
dose. The patient may have water as desired, but no other
food or fluids. Smoking should be prohibited. The patient
should rest in a chair or bed until completion of test. Mild
diarrhea is common following xylose ingestion.
* Collect the second serum sample two hours after giving the
xylose dose. Label tube clearly "Two-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.
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.
Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected
| Hemolysis: | Mild OK; Gross reject |
| Thawing: | Warm reject; Cold OK |
| Lipemia: | NA |
| Icterus: | NA |
| Other: | NA |
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 7 days |
| Frozen | 30 days | |
| Ambient | 4 hours | |
| Timed Serum | Refrigerated (preferred) | 7 days |
| Frozen | 30 days | |
| Ambient | 4 hours | |
| Urine | Refrigerated (preferred) | 7 days |
| Frozen | 30 days | |
| Ambient | 4 hours |
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