Iodine/Creatinine Ratio, Random Urine (Sendout)

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General Information

Lab Name
Lab Code
1147
External Test Id
IODCU
Description

Useful For:

  • Assessment of iodine toxicity or recent iodine exposure using a random urine collection
  • Monitoring iodine excretion rate as index of replacement therapy

Patient Preparation: High concentrations of gadolinium and iodine may interfere with inductively coupled plasma mass spectrometry-based metal tests. If either gadolinium- or iodine-containing contrast media has been administered, the specimen should not be collected for at least 96 hours.

    Ordering Note: This test is for random urine collections only. For timed collections, see test Iodine, 24h Urine (Sendout). Due to the significant variation in the rate of secretion over the course of a day, a 24-hour collection is preferred.

    References
    Synonyms
    IODCU, Iodine Excretion, Iodine Random
    Components

    Interpretation

    Method

    Iodine: Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

    Creatinine: Enzymatic Colorimetric Assay

    Reference Range
    Ref. Range Notes

    Reference Values:

    0-17 years: Not established
    > or =18 years: <584 mcg/g creatinine
    Interferences and Limitations

    Cautions: Administration of iodine-based contrast media and drugs containing iodine, such as amiodarone, will yield elevated results.

    References

    Ordering & Collection

    Specimen Type
    Urine (Random)
    Collection

    Collect random urine in a screw-cap urine collection container.

    Handling Instructions

    Outside Laboratories: Transfer urine to a screw-cap, plastic aliquot container with no metal cap or glued insert. Refrigerate urine while awaiting shipment. Transport with a cold pack.

    Stability: Refrigerated (preferred): 28 days; Frozen 28 days; Ambient: 14 days.

    Quantity
    Requested: 3 mL urine
    Minimum: 2 mL urine

    Processing

    Receiving Instructions

    Transfer urine to a screw-cap, plastic aliquot container (with no metal cap or glued insert) and refrigerate.

    Login: SEND1-;REFRIG

    • RSNDT1: MAYOSD
    • RSTYP1: URN-RAND
    • RTSRQ1: ;Iodine/Creatinine Ratio, Random Urine (Mayo Test IODCU)

    Sendouts:

    • Order Mayo Test: IODCU

    Stability: Refrigerated (preferred): 28 days; Frozen 28 days; Ambient: 14 days.

    Misc Sendout

    Performance

    Lab Department
    Frequency
    Performed: Tuesday, Friday. Reported: 2-5 days from sample receipt at Mayo Clinic Laboratories.
    Available STAT?
    No
    Performing Location(s)
    Sendout Mayo Clinic Laboratories (Superior Drive)
    800-533-1710

    3050 Superior Drive NW
    Rochester, MN 55901

    Billing & Coding

    Billing Comments

    CPTs: 83789, 82570