Today, free T4 measures direct levels more accurately. Free T4 index was used historically to estimate active hormone. T3 testing and evaluation of free T3 are important when symptoms persist. Free T4 and Free T3 measure only the unbound hormone. That is why reviewing reference range values and clinical symptoms is essential.
High cortisol directly blocks the conversion of T4 to active T3. For many patients, this is the change that finally makes them feel like themselves again. The medication is not wrong — the approach just is not addressing the conversion problem.
Many of these symptoms overlap with other conditions — adrenal fatigue, hormone imbalance, depression. We look at the full picture — Free T3, Free T4, Reverse T3, thyroid antibodies, and body temperature patterns — because that is where the real answers are. Poor nutrition is at the root of many diseases and can also create an imbalance of male hormones.
For patients with Hashimoto’s or poor gut health, reducing inflammation and restoring gut function improves thyroid hormone conversion and medication absorption. In general, dose conversions are more guesstimates based on what doses in clinical trials provided equivalent results for vasomotor symptoms and some data on hormone levels. The Canadian Menopause Society has just released a conversion table for menopause hormone therapy, including the recommended doses of progestogens (you can find it here). If estrogen dominance is raising thyroid binding globulin, correcting that imbalance with bioidentical progesterone allows thyroid hormone to circulate freely again. High estrogen raises thyroid binding candy96.fun globulin (TBG) — a protein that grabs thyroid hormone and takes it out of circulation. This is one of the main reasons we always test cortisol alongside thyroid hormones.
How does one convert between different estrogens in menopause hormone therapy (MHT)? This is what we call subclinical or functional hypothyroidism, and it is exactly what our full panel is built to catch. For most patients, early changes show up within a few weeks — energy, mood, and body temperature often improve first. Your first visit starts with a thorough history — we want to hear everything, including symptoms you have been told are not related to your thyroid. We address any deficiencies in selenium, zinc, iodine, or iron that may be slowing thyroid production or conversion. We prescribe compounded bioidentical T3/T4 combinations or desiccated thyroid (NDT) based on your specific lab values and symptoms.
Low free T4 may suggest low thyroid hormone. High free T4 may suggest producing too much thyroid hormone. Low free T4 or low levels of free T3 may signal reduced activity even when total T4 is normal.
Optimizing thyroid function requires a whole body approach. A blood sample allows measurement of hormone levels accurately. Instead, they involve functional changes in thyroid levels.
The American Thyroid Association provides guidelines for thyroid function testing. Thyroid function depends on proper T4 to T3 conversion. Normal TSH does not always equal normal thyroid. It is considered the way to initially test thyroid function. Many providers use TSH as the best way to initially test thyroid health.