Iodine, Urine
Test Mnemonic
UIODNE
CPT Codes
- 83018 - QTY (1)
Includes
- Iodine, Urine - ratio to CRT
- Hours Collected
- Total Volume
- Creatinine, Urine - per volume
- Creatinine, Urine - per 24h
- Iodine, Urine - per volume
- Iodine, Urine - per 24h
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 8 mL | Urine, 24-hour (well-mixed) | Plastic container | Refrigerated | Patient Prep: High concentrations of iodine may interfere with testing. Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, non-essential over-the-counter medications (upon the advice of their physician). Avoid iodine-containing medications or contrast agents for at least 1 month. Avoid gadolinium-based contrast media for at least 48 hours. Collection: Collect in a plastic container, mix well and aliquot into a trace metal free transport tube (ARUP #43116). Record total volume and collection time interval on specimen. |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 8 mL | Urine, random | Plastic container | Refrigerated | Patient Prep: High concentrations of iodine may interfere with testing. Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, non-essential over-the-counter medications (upon the advice of their physician). Avoid iodine-containing medications or contrast agents for at least 1 month. Avoid gadolinium-based contrast media for at least 48 hours. Collection: Collect in a plastic container, mix well and aliquot into a trace metal free transport tube (ARUP #43116). Record total volume and collection time interval on specimen. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Refrigerated | 2 months |
| Ambient | 2 months |
| Frozen | 2 months |
Days Performed
Tue, Thu, Sat
Turnaround Time
2 - 6 days
Methodology
| Name | Description |
|---|---|
| Inductively Coupled Plasma / Mass Spectrometry (ICP-MS) |
Special Info
Patient Prep: Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, non-essential over-the-counter medications (upon the advice of their physician). High concentrations of iodine may interfere with testing. Avoid iodine-containing medications or contrast agents for at least 1 month. Avoid gadolinium-based contrast media for at least 48 hours. Collection: Collect in a plastic container, mix well and aliquot into a trace metal free transport tube (ARUP #43116). Record total volume and collection time interval on specimen. Urine transported in a non-trace element-free tube or contaminated with iodine, gadolinium, blood, fecal material or acid preservative will be rejected. Elevated results may be due to skin or collection-related contamination, including the use of collection containers that are not certified to be trace element-free. Confirmation with a second specimen collected in a certified trace-element free container is recommended if an elevated result is suspected to be due to contamination. This test is New York DOH approved.
Clinical Info
This test is useful for the assessment of iodine nutritional status. This test reports total iodine from all iodine-containing species present in the specimen but does not determine the chemical form (species) of the iodine present. Values > 1000 µg/L may indicate dietary excess, but more frequently suggest recent drug or contrast media exposure.