Thyroid Labs "Normal" But Still Feel Awful? | Thunder Bay ND
The common symptoms I hear from my patients, they are fatigued, brain fogged, and not like themselves. Their hands and feet are cold, they're dealing with constipation, weight gain, hair loss, and an irregular period. They had their TSH run and it came back as "normal" but they don't feel normal.
This is the pattern. They feel exhausted, seek care, the labs tell one part of the story and they are left with no answers or solutions.
Here’s the full thyroid panel I run in practice:
TSH — thyroid stimulating hormone; your brain telling your thyroid to make more or less thyroid hormone
T4 — inactive thyroid hormone, safely transported to the tissues and cells that need it
T3 — active thyroid hormone, mainly used inside your cells
TPO antibodies — thyroid peroxidase antibody; antibody targeting enzyme that supports thyroid hormone production.
TG antibodies - Thyroglobulin antibody; antibody targeting precursor thyroid hormone.
“Normal” does not always mean optimal for you.
TSH: Most labs consider anywhere from about 0.5–4.5mIU/mL (sometimes higher) "normal." But ideally, TSH sits between 1–2.5mIU/mL. If you're trying to conceive, I really want to see it no higher than 2.5mIU/mL, since higher levels are linked to increased miscarriage risk.
Free T4: Your lab's exact reference range may vary slightly, but mid-range is best, generally around 12–16 pmol/L.
Free T3: This is the active hormone your cells use, and on its own it's the least reliable marker; a healthy, unmedicated person typically averages somewhere between 3.5–5.0 pmol/L. Low-normal T3 alongside ongoing symptoms is worth investigating, not dismissing.
Why antibodies are often the missing piece when people are in the early stages of Hashimoto's thyroiditis. They may still have normal TSH, T4, and T3 numbers but with the presence of thyroid antibodies, they experience all the symptoms of classic hypothyroidism.
Research shows that antibodies can contribute to lingering hypothyroid symptoms even when TSH looks completely normal. Think of them as an early warning sign; an indirect marker of inflammation and immune activity against the thyroid gland that often shows up before your TSH, T4, or T3 numbers ever shift out of range. This is exactly why so many women are told "your thyroid is fine" years before a full diagnosis is caught because the standard test isn't looking for it yet.
It's rarely just the thyroid
In my practice, I don't stop at the thyroid panel. A few other pieces of the puzzle tend to show up alongside Hashimoto's:
Vitamin D — low levels are closely linked to Hashimoto's and higher antibody levels.
B12 — often deficient in those with autoimmune thyroid conditions, and worth checking directly rather than assuming it's fine.
Iron — deficiency shows up in a large portion of hypothyroid patients, which matters because iron is needed for the enzymes that convert T4 into the active T3 your cells actually use.
What this means for you if your labs have come back "normal" but you still don't feel like yourself, it’s not in your head, it may just be that the full picture hasn't been tested yet. A comprehensive approach looks at your antibodies, your nutrient status, and your symptoms together, not just one number in isolation. If this sounds familiar, book a discovery call to talk through what a full thyroid workup could look like for you.
Disclaimer: This blog is for educational purposes and does not constitute medical advice. Please consult a qualified healthcare practitioner for personalized guidance.
Tags: Thyroid Health, Hashimoto's, Thunder Bay Naturopath, Hormone Testing, Hypothyroidism