TPO Antibodies
TPO antibodies (anti-TPO) are proteins produced by the immune system that mistakenly target thyroid peroxidase, an enzyme essential for thyroid hormone production.
Category: Thyroid Panel
Also known as: tpo antibodies, anti-tpo, thyroid peroxidase antibodies, tpo ab, anti tpo, thyroid peroxidase ab, anti-tpo antitela
Reference range: 0–35 IU/mL (Source: ABIM)
Standard unit: IU/mL
High values may indicate
High TPO antibodies may indicate Hashimoto's thyroiditis, Graves' disease, or other autoimmune thyroid conditions. Elevated levels increase the risk of developing hypothyroidism.
Low values may indicate
Low or absent TPO antibodies are normal and suggest no autoimmune thyroid activity.
Frequently asked questions
- What is a normal TPO Antibodies level?
- A typical reference range for TPO Antibodies is 0–35 IU/mL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is TPO Antibodies measured in?
- TPO Antibodies is most commonly reported in IU/mL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do TPO Antibodies reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track TPO Antibodies over time?
- Yes. Upload results from any lab and BloodId charts your TPO Antibodies over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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