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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 interfere with most metal tests. If either gadolinium- or iodine-containing contrast media has been administered, a specimen should not be collected for 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: 0.3 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 | Special Container |
|---|---|---|---|
| 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 hours
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 | 13362-9 |
| VL82 | Urine Volume | 3167-4 |
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.