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.

Test Limitations

Administration of iodine-based contrast media and drugs containing iodine, such as amiodarone, will yield elevated results.

Test Details

Days Test Performed

Monday, Wednesday, Friday

Analytic Time

1 - 3 days

Soft Order Code

ICRU

Synonyms

Synonyms

RIODU
Urinary Free Iodine

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Laboratory

Sendout

Laboratory Reference

Mayo ICRU

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Specimen Requirements

Offsite Collection Instructions

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.

Container

100ml Plastic Specimen Container

Normal Volume

3 mL urine

Minimum Volume

1 mL urine

Additional Information

Test sent to Mayo Clinic Laboratories.

Billing Information

Fee Codes


CPT Code

83789, 82570

LOINC

55928-6, 2161-8

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