My mom is getting ready for her RAI ablation following her TT in Oct 2012. She will be getting Thyrogen injections and my understanding was she would receive a tracer dose and scan to determine the therapy dose. I talked to a tech in the nuclear medicine department and she said since my mom will be using Thyrogen they don't do a tracer dose just a full therapy dose of 100 mil(?). She said her TSH won't stay raised long enough to do a tracer dose then a therapy dose. Does this sound correct? I have a call in to her endo to clarify.