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I 123 Thyroid Scan

I 123 Thyroid Scan

My doctor just ordered an  I 123 Scan.  I'm a bit confused about what the test involves and what the associated risks of injesting a radioactive tablet.

Also, will I be a "radioactive danger" to my 1-year old son?

I'm really very anxious, so any insight is appreciated!
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The following is a description of thyroid scan: "These exams check for conditions such as Hyperthyroid, Graves Disease and Hoshimotos. The isotope (I123) is administered by mouth in capsule form. A probe is utilized that measures the amount of radioactive material that is attached to the thyroid to see how active or inactive the thyroid gland is. Pictures are taken of the thyroid to see what the gland looks like in you, as everyone
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