text_1: I had a 70ish-year-old woman who had some sort of neurologic event when she was visiting someone in the nursing home.  We got some labs and her free thyroxine was 0.7, normal is 0.8 to 1 and her thyroid stimulating hormone was 1.8 which is pretty low for that thyroxine.  So we spent 30 to 40 minutes using an online reference.
text_2: What is the evaluation for low thyroxine and normal thyroid stimulating hormone?