The most common cause of hypothyroidism (underactive thyroid).

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.

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.

These are the primary markers for thyroid function. If these are normal, a normal TPO level generally confirms healthy thyroid health.

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

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

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