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Hormones & Thyroid: Why Functional Medicine Looks Beyond TSH

Fatigue, weight gain, anxiety, and brain fog are often labeled 'hormonal' - then dismissed because labs are 'normal.' Here's how functional medicine actually evaluates hormone health.

June 20267 min readYour Health Now
Functional medicine hormone and thyroid testing

Hormones don't work in isolation. Thyroid function depends on adrenal status, gut health, nutrient availability, and inflammatory load - and yet most patients are evaluated by a single TSH lab. When that one number falls inside a wide statistical range, they're told everything is fine. For someone whose symptoms scream otherwise, that conversation is exhausting.

What we look at instead

  • Full thyroid panel - TSH, free T4, free T3, reverse T3, plus TPO and Tg antibodies.
  • Sex hormones in context - estrogen and progesterone balance, free and total testosterone, DHEA-S.
  • Adrenal pattern - four-point salivary cortisol with DHEA, not just a 9 a.m. serum cortisol.
  • Insulin and HbA1c - because metabolic dysregulation drives hormone disruption upstream.
  • Iron, vitamin D, B12, and selenium - without these, your thyroid simply cannot convert T4 into active T3.

Why 'normal' labs aren't always healthy

A TSH of 3.8 sits inside most reference ranges, but it's a near-certain driver of fatigue, low mood, and weight resistance in someone with classic symptoms. Functional ranges are tighter, evidence-based, and designed around how you should feel - not just how a sick population looks on average.

Common patterns we see

Subclinical hypothyroidism with autoimmune antibodies. Cortisol that crashes by 2 p.m. Estrogen dominance in perimenopause. Low free testosterone in 30-something men. Each pattern has a clear playbook - but only when someone is willing to look past the surface number.

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