Iodine, Urine, 24 Hour

Test Overview

Test Methodology

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)

Test Usage

Monitoring iodine excretion rate as an index of adequate dietary iodine intake.

Reference Range *

age 0-17 years: not established; age >=18 years: 75 - 851 mcg/24 hour.

* 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 Set Up

Tuesday, Friday

Analytic Time

2 - 4 days

Soft Order Code

UIOD

MiChart Code

Iodine 24 Hour Urine (Sendout)

Synonyms

Urinary Free Iodine
QIODU

Laboratory

Sendout

Reference Laboratory

Mayo UIOD (9549)

Section

Special Testing

Specimen Requirements

Collection Instructions

Collect 24 hour urine specimen with no preservative. Aliquot 10 mL into a clean plastic container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Note: if this test is used in conjunction with the (131)I Updake Test, the specimen collection should begin immediately after the dose of (131)I is given.

Alternate Specimen

Urine with 50% Acetic Acid preservative acceptable. [5/08]

Contraindications

Do not collect specimens from patients who have received gadolinium within the past 48 hours. Gadolinium, a material contained in some contrast media, is known to interfere with most metals tests.

Normal Volume

10 mL aliquot of 24 hour urine collection

Minimum Volume

0.3 mL aliquot of 24 hour urine collection

Storage Temperature

Refrigerated preferred, ambient and frozen acceptable

Additional Information

Test sent to Mayo Medical Laboratories.

Billing

CPT Code

83789

Fee Code

AA492

LOINC

2492-7