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Test Name:
Iodine, Urine


  • TMF No:
    47075
  • Performance Lab Name:
    ARUP Laboratories
  • Test Mnemonic:
    IODINE U
  • CPT Code:
    83018
  • Ref Lab Test No:
    2007465
  • Also Known As:
    Iodide; Iodine Excretion; Urinary Iodine
  • Also See:
    Patient Instructions for 24-Hour Urine Collection; No Preservative Added
  • Patient Prep:
    Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, nonessential over-the-counter medications for 48 hours (upon the advice of their physician). In addition, the administration of iodine-based contrast media and drugs containing Iodine may yield elevated results.
  • Spec Collect:
    24-hour or random urine collection.
  • Spec Process:
    Transfer an 8 mL aliquot from a well-mixed collection to Trace Element-Free Tubes. (Min: 1 mL)
  • Spec Store Transport:
    Refrigerated.
  • Spec Stability:
    Room temperature: 2 months
    Refrigerated: 2 months
    Frozen: 2 months
  • Spec Reject:
    Specimens not received in Trace Element Free tubes. Urine collected within 48 hours after administration of a gadolinium (Gd) or iodine (I) containing contrast media (may occur with MRI studies). Acid preserved urine.
  • Spec Remarks:
    Record the total volume and collection time interval on transport tube and on test request form.
  • Methodology:
    Quantitative Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
  • Interpretive Data:

    Iodine, Urine – per volume
    0‑15 years:  No range
    16 years and older:  26.0‑705.0 µg/L

    Iodine, Urine – per 24h
    0‑15 years:  No range
    16 years and older:  93.0‑1125.0 µg/d

    Iodine per gram of Creatinine
    No reference interval (µg/g crt)

    Creatinine, Urine ‑ per 24h
    AgeMaleFemale
    3‑8 years  140‑700 mg/d  140‑700 mg/d
    9‑12 years  300‑1300 mg/d  300‑1300 mg/d
    13‑17 years  500‑2300 mg/d  400‑1600 mg/d
    18‑50 years  1000‑2500 mg/d  700‑1600 mg/d
    51‑80 years  800‑2100 mg/d  500‑1400 mg/d
    81 years and older  600‑2000 mg/d  400‑1300 mg/d

    Interpretive Data:
    Values greater than 1000 µg/L may indicate dietary excess, but more frequently suggest recent drug or contrast media exposure.

  • Additional Test Info:
    Lab Tests Online
  • Day Run:
    Tue, Sat
  • Time Reported:
    2-6 days
  • Test Type:
    METAL/ELEMENT