1 - 4 days
Urinary Free Iodine
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
Monitoring iodine excretion rate as an index of adequate dietary iodine intake.
age 0-15 years: not established; age >=16 years: 93 - 1125 mcg/specimen.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect 24 hour urine specimen with no preservative. Aliquot 10 mL into a clean plastic container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Note: if this test is used in conjunction with the (131)I Updake Test, the specimen collection should begin immediately after the dose of (131)I is given.