TPO Antibodies · high result
What does a high TPO Antibodies mean?
Short answer
TPO antibodies mark autoimmune thyroid disease — Hashimoto's thyroiditis and, in some people, Graves' disease. Around 10–15% of people (more women, more with age) test positive, and many keep a normal thyroid function for years. A positive result with a normal TSH means higher odds of developing hypothyroidism over time (roughly 2–4% per year) and matters in pregnancy planning; it is not itself a diagnosis of hypothyroidism.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
What is the normal range for TPO Antibodies?
- age 18+: 0.000 – 35.0 IU/mL
Often reflects Hashimoto's (most common) or Graves' disease. Many people have elevated TPO antibodies without overt thyroid dysfunction.
Full reference table, citations and testing options: TPO Antibodies biomarker page.
What are the common causes of high TPO Antibodies?
- Hashimoto's thyroiditis (autoimmune hypothyroidism)
- Graves' disease
- Postpartum thyroiditis
- Other autoimmune conditions (type 1 diabetes, celiac disease, pernicious anemia) — antibodies cluster
- Normal variation — positive in a meaningful share of healthy people
What symptoms go with high TPO Antibodies?
- None from the antibodies themselves
- Hypothyroid symptoms if TSH is high; goiter
What do clinicians usually check next?
- TSH and Free T4 — treatment decisions rest on function, not antibody level
- Annual TSH if function is currently normal
- Closer monitoring before and during pregnancy
- Celiac and B12 screening are often considered because autoimmune conditions cluster
Follow-up tests available at TestWell: TSH (Thyroid Stimulating Hormone) ($26.99), TSH + Free T4 ($27.99), Free T4 (Thyroxine) ($23.99).
How do you recheck TPO Antibodies?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Advanced Thyroid Panel | Panel · 7 tests | $129.99 | No | 3–5 business days |
| Thyroid Antibodies | Test · 2 biomarkers | $51.99 | No | 3–5 business days |
Common questions
My TPO antibodies are high but TSH is normal. Do I need treatment?
Not on the basis of antibodies alone. Guidelines recommend monitoring TSH (yearly, or sooner if symptoms appear) rather than treating a normal thyroid; pregnancy is the exception where thresholds differ.
Does the antibody level matter?
Higher levels modestly predict a faster progression to hypothyroidism, but the number isn't tracked for treatment — TSH is.
Sources
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.