Slimmer - just did a quick search and found a few things relating to positive TPO, but thought I'd post a few paragraphs here.
What is the thyroid peroxidase test?
Thyroid peroxidase test is a test that measures the level of an antibody that is directed against thyroid peroxidase (TPO).
Autoantibodies to thyroid peroxidase (TPOAb) are produced within the body. The presence of TPOAb in the blood reflects a prior attack on the thyroid tissue by the body's immune system.
What does a positive thyroid peroxidase test mean?
•Most people with chronic thyroiditis (70%-90%) display a positive TPO test. The test is also positive in lesser numbers of people with other thyroid diseases.
•Other autoimmune disorders that may cause a positive TPOAb test include:
◦Sjogren's syndrome,
◦lupus,
◦rheumatoid arthritis, and
◦pernicious anemia.
•About 3% of people with a positive TPOAb test show no evidence of disease.
•The chance of having a positive TPOAb test is greater in females and increases with age.
And another bit from a different site:
Results
•A TPO test will read as positive if a thyroiditic condition exists. In patients who have hypothyroidism, this is indicative of Hashimoto's disease. In hyperthyroid patients, this is indicative of the autoimmune condition of Graves' disease. Moderate thyroid peroxidase levels may indicate that a patient has thyroid cancer, anemia, rheumatoid arthritis or Type 1 diabetes. A high level of thyroid peroxidase means that a patient has Graves' disease or Hashimoto's disease
Here's more:
Thyroid peroxidase antibody: TPOAb
Hashimoto’s thyroiditis; Graves’ disease When patient has symptoms suggesting hypothyroidism; when a doctor is considering starting a patient on a drug therapy that has associated risks of developing hypothyroidism when thyroid peroxidase antibodies are present, such as lithium, amiodarone, interferon alpha, or interleukin-2 Has been associated with reproductive difficulties, such as miscarriage, preeclampsia, premature delivery, and in-vitro fertilization failure.
So I am definitely out of my league on this, and I don't mean to cause more concern, but it sounds like something that could potentially be an issue at some point. Hope the Dr. can give you more and good info.