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A member asked:
How long do i have to wait after a nuclear medicine thyroid scan, i-123, to have a fna biopsy and/or thyroid blood tests?
7 doctors weighed in across 3 answers
Any time: Fna of thyroid can be done any time. Most of the time thyroid hormones are not affected by thyroid scans with i-123. However, in some occasions, depending on the iodine status and the condition of the thyroid there might be a decrease uptake of iodine by thyroid and cause transient hypothyroidism ( wolf-chiakoff phenomenon ).
Answered 5/2/2014
4.1k views
You don't wait.: Generaly speaking you do not need to wait at all after having an I 123 thyroid scan to have a biopsy. You usually have the biopsy scheduled after the results of the thyroid scan are interpreted which usually takes a day. The radiation from the I 123 is minimal .
Answered 10/4/2015
4k views
Radiation...: The physical half life of I-123 is approximately 13 hours. To avoid radiating the person doing the biopsy, you could wait until it clears from your system. Other than that, waiting is not necessary.
Answered 9/14/2014
4k views
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