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Test Code IOD Iodine, Serum

Reporting Name

Iodine, S

Useful For

Determining iodine overload using serum specimens

 

Monitoring iodine levels in individuals taking iodine-containing drugs

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Specimen Required


Patient Preparation:

1. Disinfectants (such as Betadine) that contain iodine should not be used during venipuncture.

2. 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, a specimen should not be collected for 96 hours.

Supplies:

-Metal Free B-D Tube (No Additive), 6 mL (T184)

-Metal Free Specimen Vial (T173)

Collection Container/Tube: Plain, royal blue-top Vacutainer plastic trace element blood collection tube

Submission Container/Tube: 7-mL Mayo metal-free, screw-capped, polypropylene vial

Specimen Volume: 1 mL

Collection Instructions:

1. Allow specimen to clot for 30 minutes; then centrifuge the specimen to separate serum from the cellular fraction.

2. Remove the stopper. Carefully pour specimen into Mayo metal-free, polypropylene vial, avoiding transfer of the cellular components of blood. Do not insert a pipet into the serum to accomplish transfer, and do not ream the specimen with a wooden stick to assist with serum transfer.

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


Specimen Minimum Volume

0.3 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 21 days
  Ambient  21 days
  Frozen  21 days

Reference Values

40-92 ng/mL

Day(s) Performed

Tuesday, Friday

CPT Code Information

83789

LOINC Code Information

Test ID Test Order Name Order LOINC Value
IOD Iodine, S 2494-3

 

Result ID Test Result Name Result LOINC Value
81574 Iodine, S 2494-3

Interpretation

Values between 80 ng/mL and 250 ng/mL have been reported to indicate hyperthyroidism.

 

Values above 250 ng/mL may indicate iodine overload.

Report Available

1 to 4 days

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK

Method Name

Inductively Coupled Plasma Mass Spectrometry (ICP-MS)