follow up testing.

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Had TT in Feb 2011, followed by RAI .... had one WBS right after RAI treatment.  since then, I have had only ultrasounds, and thyroglobulin test. No stimulated thyroglobulin, in other words, I have not gone hypo or had thyrogen shots. Is this the norm with you guys??? I had malignancy in both sides of thyroid, and 4 of 19 lymph nodes...