The most common cause of hypothyroidism (underactive thyroid).
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? thyroid peroxidase level 9
The Thyroid Peroxidase antibody test measures the amount of antibodies your immune system produces against an enzyme (TPO) found in the thyroid gland. thyroid peroxidase level 9
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
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.