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Test ID IODU Iodine, Random, Urine

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

Specimen Type

Urine


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

83789

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

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.

Interpretation

Daily urinary output <20 mcg/L suggest dietary deficiency.

 

Values >1,000 mcg/L may indicate dietary excess, but more frequently suggest recent drug or contrast media exposure.

Clinical Reference

1. Knudsen N, Christiansen E, Brandt-Christensen M, et al: Age- and sex-adjusted iodine/creatinine ratio. A new standard in epidemiological surveys? Evaluation of three different estimates of iodine excretion based on casual urine samples and comparison to 24 h values. Eur J Clin Nutr 2000;54:361-363

2. Liberman CS, Pino SC, Fang SL, et al: Circulating iodine concentrations during and after pregnancy. J Clin Endocrinol Metab 1998;83:3545-3549

Analytic Time

1 day

Method Name

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)