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Test ID: FXAB    
Xylose Absorption Test (Adult 25g dose)

Available on the App Store

Specimen Type Describes the specimen type needed for testing

Serum
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.

Serum: 0.5 mL Urine: 3 mL

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 TypeTemperatureTime
SerumRefrigerated (preferred)7 days
 Frozen 30 days
 Ambient 4 hours
Timed SerumRefrigerated (preferred)7 days
 Frozen 30 days
 Ambient 4 hours
UrineRefrigerated (preferred)7 days
 Frozen 30 days
 Ambient 4 hours