01/31/2026
👉 So, you believe you have a thyroid issue and ask your doctor for a test.
👉 They perform a TSH blood test, and everything comes back “normal”.
👉 You’re left feeling confused, unheard, and not sure where to turn next.
The truth is, thyroid health is complex, and a single test often isn't enough to give a full picture. In my practice, here are the thyroid tests that we most commonly check and what they each reveal:
1️⃣ TSH (Thyroid-Stimulating Hormone):
TSH measures the hormone that signals your thyroid to produce hormones. However, a "normal" TSH level doesn't always mean your thyroid is functioning properly, as it doesn't measure thyroid hormones directly.
2️⃣ Free T4 (Thyroxine):
Free T4 measures the unbound, active form of thyroxine in your blood. It helps determine how much thyroid hormone is available, indicating whether your thyroid is underactive or overactive.
3️⃣ Free T3 (Triiodothyronine):
Free T3 measures the active thyroid hormone triiodothyronine, which directly influences metabolism. Low levels can indicate issues with hormone conversion or cellular uptake.
4️⃣ Reverse T3 (rT3):
Reverse T3 is an inactive form of T3, often elevated due to stress or illness. Testing rT3 helps determine if your body is converting T4 into active T3 or the inactive form, which can slow metabolism.
5️⃣ Thyroid Peroxidase Antibodies (TPOAb):
This test measures antibodies against thyroid peroxidase, an enzyme vital for hormone production. High TPOAb levels suggest an autoimmune response, commonly seen in Hashimoto's.
6️⃣ Thyroglobulin Antibodies (TgAb):
TgAb measures antibodies against thyroglobulin, a protein produced by the thyroid. High TgAb levels can indicate autoimmune thyroid disorders and are used to diagnose and monitor these conditions.
✴️ Women are more likely to suffer from thyroid conditions especially between the ages of 30 - 60.
✴️ Common symptoms can include fatigue, hair shedding, dry skin, unwanted weight gain (or loss), elevated cholesterol, poor temperature regulation and constipation.
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Read more here:
https://www.ncbi.nlm.nih.gov/books/NBK279414/