After joining the Forum and learning about the importance of FT3, I got mine tested and found that even though my FT4 was very high in the
range, my FT3 was very low in the
range.
After a med change to a combo T4/T3 med, my dosage has been tweaked until now FT4 is .90 (range is .60 - 1.50) and my FT3 is 3.8 (range is 2.3 - 4.2). I did not take meds until after the blood draw. Testing also showed a low level of Vitamin D, which is quite common with hypothyroidism, so I supplement that.