Thyroid Peroxidase Level 9 [2025]

An autoimmune cause of hyperthyroidism (overactive thyroid). Next Steps and Considerations

A level of 9 IU/mL falls well within this range, suggesting that your immune system is not currently attacking your thyroid gland. Why Is the TPO Test Done?

Laboratory "normal ranges" can vary slightly. You should always compare your result against the specific reference range provided on your lab report. thyroid peroxidase level 9

Doctors usually order this test to help diagnose or rule out autoimmune thyroid conditions:

If you are experiencing symptoms like fatigue, weight changes, or hair loss despite a normal TPO result, your doctor may look for non-autoimmune causes or monitor your levels over time. An autoimmune cause of hyperthyroidism (overactive thyroid)

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The most common cause of hypothyroidism (underactive thyroid). Laboratory "normal ranges" can vary slightly

The Thyroid Peroxidase antibody test measures the amount of antibodies your immune system produces against an enzyme (TPO) found in the thyroid gland.