Hi Dr Lupo,
I'm a 45 year old female. I underwent a total thyroidectomy in Dec 2009 for Papillary thryoid cancer T2,N1b, M0, involving both sides of the thyroid, though the left side was microcarcinoma which did not show up on any ultrasound scans. I had RAI 131 treatment 29 Jan 2010 at which time my Thyroglobulin was 3.9 and thyroglobulin antibodies were 2. I had a test on the 2 March 2010 which showed zero change,still Thyroglobulin at 3.9 and antibodies at 2. My endocrinologist said to wait and see as the RAI131 can take time to work. I'm worried that my cancer is still there somewhere. What is the normal timescale for thyroglobulin to decrease after RAI 131 and what effect will my antibodies have on my test results? Sorry, I'm quite a bit worried as you can imagine, I have two little boys and I can't get this out of my head.