1 - 3 days
Urinary Free Iodine
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
Assessment of iodine toxicity or recent exposure when a 24-hour urine cannot be collected. Monitoring iodine excretion rate as index of replacement therapy when a 24-hour urine cannot be collected.
0-17 years: not established; age >=18 years: <584 mcg/g creatinine.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Due to the significant variation in the rate of secretion over the course of a day, a 24-hour collection is preferred. Collect urine in a clean, plastic container with no metal cap or glued insert and no preservative. Collection must take place prior to or 48 hours after administering gadolinium-containing contrast media. Refrigerate.