TPO Antibodies
An immune marker showing whether your body is attacking your own thyroid — the most common cause of an underactive thyroid.
What the numbers mean
These are the ranges BioForge works to. They are not the same as a lab's reference range, which is built from the general population rather than from people who feel well.
What moves TPO Antibodies
Positive antibodies mean the thyroid will likely decline over time even if TSH looks fine today — it changes how closely we monitor you. Not moved by diet or supplements in any reliable way. Worth checking once at baseline.
Related markers in Thyroid
This page is educational and is not medical advice. Ranges are general and do not account for your history, medications or symptoms — a single number never decides a protocol. Your results are interpreted by a licensed clinician alongside everything else about you. Back to the Learning Center
Want to know where your numbers actually sit?
Every BioForge protocol starts from your own bloodwork. The first 15-to-30-minute call is free.