What is a normal TPO antibody level?
The short answer
A typical US lab calls TPO antibodies normal up to 34 IU/mL. That range exists to catch disease, not to describe your best.
Nobody we follow has said what your TPO antibodies should be. It comes up on the shows, but never with a number.
What TPO antibodies measures
Antibodies against the enzyme your thyroid uses to make hormone.
They are the most common marker of autoimmune thyroid disease, and can appear years before hormones shift.
Checked against MedlinePlus — Thyroid Antibodies.
Common questions
What is a normal TPO antibodies level?
Most US labs print 0–34 IU/mL. Your report grades you against that range. It exists to catch disease, not to describe your best.
What does your TPO antibodies number mean?
On a typical lab range, up to 34 IU/mL is normal and over 34 is high. Your own report prints its range next to your number, and that is the one your lab uses. Nobody we follow has drawn a line inside that range.
What does the TPO antibodies test measure?
Antibodies against the enzyme your thyroid uses to make hormone. They are the most common marker of autoimmune thyroid disease, and can appear years before hormones shift.
Why is there no target here?
Because nobody we follow has named a number for TPO antibodies. If that changes, it will be here.