Iodine, 24-Hour Urine (replacement)

Urine Iodine

Test Codes

EPIC: LAB1232166, Beaker: Iodne, 24U, Quest: 16602

Department

Send Outs

Instructions

• Please refer to the Specimen Collection Manual for instructions on 24-Hour Urine Collection:
  • Urine 24-Hour Collection - Inpatient
  • Urine 24-Hour Collection - Outpatient
  • Urine 24-Hour Collection - Outreach

Specimen Collection Criteria

Collect: 24-hour urine sample with no preservative.

Include start and end dates and times for the collection period on the specimen container.

Physician Office/Draw Specimen Preparation

Maintain specimens at room temperature (20-26°C or 68-78.8°F) prior to transport.

Preparation for Courier Transport

Transport: Entire 24-hour urine collection, at room temperature (20-26°C or 68-78.8°F).

Rejection Criteria

• Random urine specimens.
• Specimens not collected and processed as indicated.

In-Lab Processing

Measure total volume of 24-hour urine specimen. Record total volume and collection start and end dates and times in the LIS system. Aliquot 10.0 mL from the well-mixed 24-hour urine collection. (Minimum: 2.0 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 10 days
Refrigerated (2-8°C or 36-46°F): 10 days
Frozen (-20°C/-4°F or below): Unacceptable

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Quest Diagnostics, Wood Dale, IL.

Performed

Tuesday – Saturday.
Results available in 2-3 days.

Reference Range

70-500 mcg/24 h

Test Methodology

Inductively Coupled Plasma/Mass Spectrometry (ICP/MS).

Interpretation

By report.

Clinical Utility

Iodine is as essential element that is required for thyroid hormone production. The measurement of urinary iodine serves as an index of adequate intake.

CPT Codes

82542

Contacts

Last Updated

12/17/2025