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Test Name:
Iodine, Urine, Random
- SBMF No:
42278 - Performance Lab Name:
Mayo Medical Laboratories - Test Mnemonic:
U IODINE R - ABN:
Required – Not FDA-Approved - CPT Code:
83789 - LOINC Code:
19146-0 - Ref Lab Test No:
8639 - Also Known As:
Iodide Excretion
Iodine Excretion
Urinary Free Iodide
Urinary Free Iodine - Also See:
42202 Iodine, Urine, 24-Hour - Spec Type:
Urine, random - Spec Container:
Plastic, metal-free container with tightly fitting lid (no preservative) - Pref Vol:
2.0 mL - Min Vol:
0.2 mL - Patient Prep:
If patient has been administered gadolinium-containing contrast media for radiographic studies wait at least 48 hours before collecting the specimen - Spec Collect:
Routine random urine collection
Do not collect urine specimens in the environment in which exposure is likely to occur. It is important that dust from clothing not contribute to the specimen contents.
Do not collect urine in metal-based containers such as metal urinals or pans.
Do not collect or transport urine in colored containers because of metals found in dyes. - Spec Store Transport:
Refrigerated preferred
Room temperature or frozen acceptable - Spec Remarks:
High concentrations of gadolinium are known to interfere with most metals tests. If gadolinium-containing contrast media has been administered, a specimen should not be collected for 48 hours. - Methodology:
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) - Use:
Monitoring iodine excretion rate as an index of daily iodine replacement therapy
Correlating total body iodine load with (131)I uptake studies in assessing thyroid function - Clinical Significance:
Iodine is an essential element for thyroid hormone production. The measurement of urinary iodine serves as an index of adequate dietary iodine intake. - Reference Range:
0-15 years: Not Established
> or =16 years: 26-705 mcg/L - Additional Test Info:
Administration of iodine-based contrast media and drugs containing iodine, such as amiodarone, will yield elevated results.
This test was developed and its performance characteristics determined by Laboratory Medicine and Pathology, Mayo Clinic. This test has not been cleared or approved by the U.S. Food and Drug Administration.
- Day Run:
Mon-Fri - Time Run:
5:00 pm - Time Reported:
2-5 days - Test Type:
CHEMISTRY
