Elle Russ has a really great section in her book The Paleo Thyroid Solution about the testing that you need done if you suspect you have a thyroid problem. The issue is I understand, that standard medical practitioners are only usually testing T4 and TSH levels to determine thyroid function. Hypothyroidism can go undiagnosed if your doctor only looks at these factors. Most doctors ignore the all important active T3 as well as issues that can show up by looking at Reverse T3. TSH and T4 are all that my doctor has ever tested on me I know that.
Elle recommends that you test: Free T3, Reverse T3, Free T4, TSH, TPOAb & TgAb (for Hashimoto’s). There are other recommended tests to go along with the these thyroid levels which are related to thyroid issues being: Vitamin D 25-Hydroxy, Homocysteine, B12, Ferritin, DHEA-sulfate, morning cortisol or 24hour cortisol saliva test, free testosterone, progesterone, and estradiol. Ok so it’s not simple! If you want to learn more she has a great talk on Youtube with Dave Asprey which is where I first discovered her work. I have also read her book and I recommend it too because it goes into great detail about this condition and the unconventional solutions. It was all new to me!