Days Set Up
Monday, Wednesday, Friday
Analytic Time

1 - 3 days

Soft Order Code

Test Updated:


Urinary Free Iodine

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All specimens should be accompanied by a requisition.

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Test Overview

Test Methodology

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)

Test Usage

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.

Reference Range

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

Collection Offsite

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.

100ml Plastic Specimen Container
Normal Volume
3 mL urine
Minimum Volume
1 mL urine

Billing Information

CPT Code
83789, 82570
Pro Fee Code
55928-6, 2161-8

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.