Dr Kent Holtorf har skrevet en artikkel om hvordan blodprøver ikke forteller hele sannheten om stoffskiftet http://nahypothyroidism.org/thyroid-...e-whole-story/

Reverse T3 (RT3) levels are also important to examine. Reverse T3 is a marker for reduced T4 to T3 conversion. T4 can either be converted to T3 (energy) or RT3, which is the inactive form of T3 and has antithyroid effects. If too much RT3 is made in proportion to FT3, the excess RT3 blocks the T4 from getting into the cells, effectively blocking the effect of the thyroid.
The best indicator of thyroid hormone levels in the cells is the FT3/RT3 ratio. In healthy individuals, the RT3 is usually below 250 pg/ml, and the Free T3/Reverse T3 ratio is greater than 1.8 (if Free T3 is in ng/dl) or 0.018 (if Free T3 is in pg/ml).

If you feel tired all the time and have the typical symptoms of hypothyroidism, and also have any of the physical issues mentioned, perhaps you should ask your doctor to look deeper into your thyroid health. All it takes is a simple blood test to measure your Free T3/Reverse T3 ratio. Getting the right tests and diagnosis could mean the difference between living a life with energy or suffering with unnecessary fatigue and other health issues.