|Epic Lab Code:||LAB5791|
|Downtime Form:||A-1a Miscellaneous Request|
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.
> or =16 years: 93-1125 mcg/specimen
Values >1000 mcg/specimen may indicate dietary excess, but more frequently suggest recent drug or contrast media exposure.
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.
Urine Tests Requiring Preservatives, Refrigeration or Special Containers