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UIO24 / UIOD-M
IODINE, 24-HOUR URINE

Test Code UIO24 / UIOD-M 
Test IODINE, 24-HOUR URINE 
Methodology Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) 
Description This test is designed to monitor iodine excretion rate as an index of daily iodine replacement therapy and for correlating total body iodine load with (131) I uptake studies in assessing thyroid function. 
Specimen 10 mL from a 24-hour urine collection. See "Urine Preservatives" in Special Instructions for multiple collections. Send specimen refrigerated in a plastic,13-mL urine tube.

Note: 1. 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.

2. 24-Hour volume is required on request form for processing. 

Reference Values Iodine concentration: 42-350 mcg/L

Iodine 24-Hour concentration: 100-460 mcg/specimen 

Analytic Time 1 Day 
Day(s) Test Set Up Monday, Wednesday, Friday 
CPT Code(s) 83789  

Special Instructions