Thyroperoxidase Ab (TPO Ab) – Antimicrosomal Ab **

Antibodies are immune system proteins that fight foreign substances like viruses and bacteria. Sometimes antibodies attack the body’s cells, tissues, and organs by mistake, known as an autoimmune response. When thyroid antibodies attack healthy thyroid cells, it can lead to Hashimoto’s or autoimmune thyroiditis. This test measures the level of thyroid antibodies in your blood.