1 - 3 days
Test Updated:
RIODU
Urinary Free Iodine
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Test Overview
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.
Specimen Requirements
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.
