For an uptake scan, a very small amount (tracer dose) of either 131I or 123I is used. The amount is usually between 2 and 4mCi. For treatment, the standard is to use 131I usually in a dose anywhere from 50 to 200mCi depending on risk, metastases, etc...
I had a total ablation of my thyroid with 12 microcurries of 131I, so I would be very upset if they were giving me a dose of 4mCi for a scan. They give 7mCi to Grave's patients to "wound" the thyroid sometimes.
It is as AR-10 says.
I had the uptake scan and I 123 was used with pertechium (tracer). This iodine doesnt kill or harm the thyroid.
I was given it outside the room then taken in to do the scan. All up it took about 40 minutes.
The RAI is I 131 and does kill the thyroid.
I am scheduled tomorrow for RAI (friday) and am to be given 8mCi to be given by capsule.
The reason for the low dose is drug sensitivity and thyroid cancer to later be removed in 3 months time via keyhole surgery.
Maybe Australia do things differently.
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