Graves’ Disease Diagnosis – Tests to Check Thyroid Hormone …

Since Graves’ disease is an autoimmune disorder (where your immune system attacks healthy body tissue), this blood test may be recommended. TPO measures the level of thyroid peroxidase antibodies. If you have those antibodies in your blood, it suggests that the immune system has attacked the thyroid. However, about 5-10% of healthy people …

https://www.endocrineweb.com/conditions/graves-disease/graves-disease-diagnosis