My blood work was “normal” according to my family practice doctor, but my uptake showed 61%, so perhaps this is similar to what your mother is experiencing. I talked with a friend of mine who is an internist, and he said that the T4 and TSH can be within the normal range, with the T3 out of control. Unless a special blood test is done for T3 (and I forget what he called it, free T3, ResinT3???) you won’t pick up the problem. You might want to check to see precisely what was measured in your Mom’s bloodwork.