TSH (thyroid-stimulating hormone) is a key blood biomarker for thyroid function. Normal reference ranges are typically 0.4–4.0 mU/L, but vary by lab. A microbiome test cannot measure or replace TSH. While there is emerging mechanistic research on a gut–thyroid axis (e.g., gut microbiota influencing thyroid hormone conversion), the evidence is preliminary and not sufficient for clinical or consumer recommendations. MyBody-X offers a Hormone Check that includes TSH along with testosterone, SHBG, prolactin, and others – that is the appropriate test for thyroid assessment. Microbiome tests are not validated for TSH evaluation. If TSH values are abnormal, a physician should interpret them in context (free T3, free T4, antibodies).
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