Test ID: FXAB
Xylose Absorption Test (Adult 25g dose)
NY State Approved 
Indicates the status of NY State approval and if the test is orderable for NY State clients.
Profile Information A profile is a group of laboratory tests that are ordered and performed together under a single Mayo Test ID. Profile information lists the test performed, inclusive of the test fee, when a profile is ordered and includes reporting names and individual availability.
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| FXAB1 | Total Volume | No | Yes |
| FXAB2 | Dosage | No | Yes |
| FXAB3 | Serum Xylose at 2 hours | No | Yes |
Method Name A short description of the method used to perform the test
Quantitative Spectrophotometry
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
Aliases Lists additional common names for a test, as an aid in searching
Dxylose FORWARD
Xylose 25g FORWARD
Xylose Adult 25g FORWARD
Xylose FORWARD
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 |
Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
Several drugs can interfere with test results
-Aspirin
-Atropine
-Cochicine
-Digitalis
-Indomethacin
-MAO inhibitors
-Nalidixic acid
-Neomycin
-Opium alkaloids
-Phenelzine
Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
Serum fasting specimen: No reference intervals for the fasting
serum: it is used as a blank when testing the two-hour specimen.
Serum xylose at 2 hours:
17 years and older: 32-58 mg/dL
Xylose excretion, % dose 5 hr:
17-64 years: 16-40 %
65 years and older: 14-40 %
Xylose excretion, g/5 hr:
17-64 years: 4.0-10.0 g/5hrs
65 years and older: 3.5-10.0 g/5hrs
Test Performed By: ARUP Laboratories
500 Chipeta Way
Salt Lake City, UT 84108
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.
Tuesday, Thursday
Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.
Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result
Performing Laboratory Location The location of the laboratory that performs the test
CPT Code Information Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Medical Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.
84620
LOINC® Code Information Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the result codes returned for this test or profile.
| Result ID | Reporting Name | LOINC Code |
|---|---|---|
| Z2659 | Total Volume | In Process |
| Z2660 | Dosage | In Process |
| Z2661 | Serum Xylose at 2 hours | In Process |
| Z2662 | Xylose Excretion, g/5 hr | In Process |
| Z2663 | Xylose Excretion, % Dose 5 hr | In Process |
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