Iodine, 24 Hour Urine
Label Mnemonic: IODINEU
Epic Lab Code: LAB5791
Downtime Form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mail-out Laboratory
5231 RCP
24 Hour Urine More information
Specimen Instructions:
Refrigerate during 24 hr collection in plastic container. Collection should be kept refrigerated for stability and submission to Core Laboratory.

Note: If this test is used in conjunction with the (131)I uptake test, then specimen collection should begin immediately after the dose of (131)I is given (ie, the patient should void and discard urine just prior to the (131)I, and all subsequent urine should be collected for the next 24 hours). The last void should be included in the collection.
Collection Medium:
Urine - 24 hour/timed plastic urine container
10 mL from a 24-hour urine collection
Turn Around Time:
3 days upon receipt at reference laboratory
Reference Range:
0-15 years: not established
> or =16 years: 93-1125 mcg/specimen
Interpretive Data:
Daily urinary output <90 mcg/specimen suggests dietary deficiency.

Values >1000 mcg/specimen may indicate dietary excess, but more frequently suggest recent drug or contrast media exposure.
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.

There are no known analytic interferences with this procedure.

Administration of iodine-based contrast media and drugs containing iodine, such as amiodarone, will yield elevated results.

Gadolinium is known to interfere with most metals tests. If gadolinium-containing contrast media has been administered a specimen can not be collected for 48 hours.

Frozen specimens sometimes result in falsely-lowered results.
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
CPT Code: