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
Send aliquot in a clean, plastic aliquot container with no metal cap or glued insert.
High concentrations of gadolinium and iodine are known to interfere with most metals tests. If either gadolinium- or iodine-containing contrast media has been administered, a specimen should not be collected for 96 hours.
Administration of iodine-based contrast media and drugs containing iodine, such as amiodarone, will yield elevated results.
Enzymatic Colorimetric Assay
Iodine is an essential element for thyroid hormone production.
The measurement of urinary iodine serves as an index of adequate dietary iodine intake.
0-17 years: not established
> or = 18 years: <584 mcg/g creatinine
Measurement of urinary iodine excretion provides the best index of dietary iodine intake and deficiency is generally indicated when the concentrations are below 100 mcg/L. For deficiency, 10 repeat random urines are recommended.