Iodine, Urine

Casandra

Casandra Test Code AR69334Version 1 (DRAFT)

Performing Lab

Lab ARUP LaboratoriesLab Test ID 2007465CPT Code 83018

Also known as: IODINE U

Clinical Use

Order Test

Use

Recommended for the assessment of iodine nutritional status. This test reports total iodine from all iodine-containing species present in the specimen but does not determine the chemical form (species) of the iodine present. It is useful for determining iodine excess and monitoring iodine overload in patients administered iodine-containing medications.

Special Instructions

Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, nonessential over-the-counter medications for 48 hours upon the advice of their physician. Additionally, administration of iodine-based contrast media and drugs containing iodine may yield elevated results. Specimen must be collected in a plastic container and should be refrigerated after collection.

Limitations

Elevated results may be due to skin or collection-related contamination, including the use of collection containers that are not certified to be trace element-free. If an elevated result is suspected to be due to contamination, confirmation with a second specimen collected in a certified trace element-free container is recommended. This test was developed and its performance characteristics determined by ARUP Laboratories; it has not been cleared or approved by the US FDA.

Test Details

New York Approved

Methodology

Mass Spectrometry

Biomarkers

Iodine

Analyte

Iodine Measurement • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

LOINC Codes

Order Codes

35674-1
2162-6
19153-6
30211-7
26842-5
2492-7
55928-6

Result Turnaround Time

1-5 days

Specimen

Urine

Volume

8 mL

Minimum Volume

1 mL

Container

ARUP Trace Element-Free Tubes (ARUP supply #43116)

Collection Instructions

24-hour or random urine collection. Transfer an 8 mL aliquot from a well-mixed collection to ARUP Trace Element-Free Tubes.

Patient Preparation

Discontinue nutritional supplements, vitamins, minerals, nonessential over-the-counter medications for 48 hours upon physician's advice.

Storage Instructions

Refrigerated.

Causes for Rejection

Acid-preserved urine, specimens collected within 72 hours after administration of iodinated or gadolinium-based contrast media, specimens contaminated with blood or fecal material, and specimens transported in non-trace element-free transport tube.