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Test Code LAB3356 Iodine, Random, Urine

Additional Codes

Mayo Test Code: IODU

Reporting Name

Iodine, Random, U

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

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Collection Container/Tube: Clean, plastic urine collection container

Submission Container/Tube: Plastic, 5-mL tube (T465) or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 1 mL

Collection Instructions:

1. Collect a random urine specimen.

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

Specimen Minimum Volume

0.3 mL

Specimen Stability Information

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

Reference Values

0-15 years: not established

≥16 years: 26-705 mcg/L

Day(s) and Time(s) Performed

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

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


LOINC Code Information

Test ID Test Order Name Order LOINC Value
IODU Iodine, Random, U 2495-0


Result ID Test Result Name Result LOINC Value
8639 Iodine, Random, U 2495-0

Reject Due To









Method Name

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)