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Test ID NBLD0720 Iodine/Creatinine Ratio, Random, Urine

Useful For

Assessment of iodine toxicity or recent iodine exposure using a random urine collection

 

Monitoring iodine excretion rate as index of replacement therapy

Specimen Type

Urine


Ordering Guidance


Due to the significant variation in the rate of excretion over the course of a day, a 24-hour collection is preferred. For more information see UIOD / Iodine, 24 Hour, Urine.



Specimen Required


Patient Preparation: High concentrations of gadolinium and iodine may interfere with inductively coupled plasma mass spectrometry-based metal tests. If either gadolinium- or iodine-containing contrast media has been administered, the specimen should not be collected for at least 96 hours.

Supplies: Urine Tubes, 10 mL (T068)

Collection Container/Tube: Clean, plastic urine collection container

Submission Container/Tube: Plastic, 10-mL urine tube or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 3 mL

Collection Instructions:

1. Collect a random urine specimen.

2. See Metals Analysis Specimen Collection and Transport for complete instructions.


Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 28 days
  Frozen  28 days
  Ambient  14 days

Reject Due To

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Day(s) Performed

Tuesday, Friday

Report Available

2 to 5 days

Method Name

IODC: Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

CRETR: Enzymatic Colorimetric Assay

Reporting Name

Iodine/Creat Ratio, Random, U

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Secondary ID

610708

CPT Code Information

83789

82570

Reference Values

0-17 years: Not established

≥18 years: <584 mcg/g creatinine

Test Classification

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

Profile Information

Test ID Reporting Name Available Separately Always Performed
IODC Iodine/Creat Ratio, U No Yes
CRETR Creatinine, Random, U No Yes