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HelpTest Code GDU Gadolinium, 24 Hour, Urine
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
Gadolinium, 24 Hr, USpecimen Type
UrineOrdering Guidance
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Patient Preparation: High concentrations of gadolinium and iodine are known to potentially interfere with most inductively coupled plasma mass spectrometry-based metal tests. If either gadolinium- or iodine-containing contrast media has been administered, a specimen should not be collected for at least 96 hours.
Supplies: Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL urine tube or clean, plastic aliquot container with no metal cap or glued insert
Specimen Volume: 0.35 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Refrigerate specimen within 4 hours of completion of 24-hour collection.
3. See Metals Analysis Specimen Collection and Transport for complete instructions.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 28 days |
| Ambient | 28 days | |
| Frozen | 28 days |
Specimen Minimum Volume
0.2 mL
Special Instructions
Day(s) Performed
Thursday
Specimen Retention Time
14 daysReport Available
2 to 8 daysReference Values
0-17 years: Not established
≥18 years: <1.1 mcg/24 h
Useful For
Assessing chronic exposure and monitoring effectiveness of dialysis in a 24-hour urine collection
CPT Code Information
83018
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| GDU | Gadolinium, 24 Hr, U | 8201-6 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 29252 | Gadolinium, 24 Hr, U | 8201-6 |
| TM101 | Collection Duration (h) | 13362-9 |
| VL82 | Volume (mL) | 3167-4 |
Method Description
The metal of interest is analyzed by inductively coupled plasma mass spectrometry.(Unpublished Mayo method)
Supportive Data
An evaluation of urine gadolinium concentration in healthy human subjects not exposed to gadolinium within 96 hours of specimen collection generated a reference range of less than 0.7 mcg/24 hours with no evidence of age or gender trend.
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.