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TEST ID IODCU Iodine/Creatinine Ratio, Random, Urine

Reporting Name

Iodine/Creat Ratio, Random, U

Specimen Type

Urine


Ordering Guidance


Due to the significant variation in the rate of secretion 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 are known to interfere with most metal tests. If either gadolinium- or iodine-containing contrast media has been administered, wait a minimum of 96 hours before starting collection.

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 Special Container
Urine Refrigerated (preferred) 30 days
  Frozen  30 days
  Ambient  14 days

Method Name

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

CRETR: Enzymatic Colorimetric Assay

Reject Due To

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

Reference Values

0-17 years: Not established

≥18 years: <584 mcg/g creatinine

Day(s) Performed

Tuesday, Friday

Report Available

2 to 5 days

Specimen Retention Time

14 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

83789

82570

Useful For

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

 

Monitoring iodine excretion rate as index of replacement therapy

Profile Information

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