Sign in →

Test ID UIOD Iodine, 24 Hour, Urine

Useful For

Monitoring iodine excretion rate as an index of daily iodine replacement therapy

 

Correlating total body iodine load with (131)I-uptake studies in assessing thyroid function

Method Name

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)

Reporting Name

Iodine, 24 Hr, U

Specimen Type

Urine

Container/Tube: Plastic, 10-mL urine tube (Supply T068) or clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 10 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. Refrigerate specimen within 4 hours of completion of 24-hour collection.

3. See Trace Metals Analysis Specimen Collection and Transport in Special Instructions for complete instructions.

Additional Information:

1. 24-Hour volume is required.

2. See Urine Preservatives in Special Instructions for multiple collections.

3. If this test is used in conjunction with the (131)I uptake test, then specimen collection should begin immediately after the dose of (131)I is given (ie, the patient should void and discard urine just prior to the (131)I, and all subsequent urine should be collected for the next 24 hours). The last void should be included in the collection.

 

Urine Preservative Collection Options

 Ambient

Yes

Refrigerated

Preferred

Frozen

Yes

6N HCl

No

50% Acetic Acid

Yes

Na2CO3

No

Toluene

No

6N HNO3

No

Boric Acid

No

Thymol

No

Specimen Minimum Volume

0.3 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 146 days
  Ambient  146 days
  Frozen  146 days

Clinical Information

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

Reference Values

0-15 years: not established

≥16 years: 93-1,125 mcg/specimen

Cautions

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

Day(s) Performed

Monday, Tuesday, Wednesday, Friday; 5 p.m.

Report Available

1 day

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

83018

NY State Approved

Yes