Thyroid Tests Flashcards
What is the FTI?
Free thyroxine index
Tells if abnormal amounts of T4 present because of abnormal amounts of thyroxine binding globulin
What is the most common thyroid test?
TSH
What is the best measure of active hormonal status?
Free T4/Free thyroxine
What can elevate total T4 levels?
Pregnancy
Estrogen replacement
Birth control pills
Why is free T3 less reliable?
Assay conditions can affect the result
What is the most commonly used test for cancer surveillance?
Thyroglobulin
What are things that can cause thyroglobulin levels to rise?
Graves
Thyroiditis
Carcinoma
What antibodies are most commonly present in Hashimoto’s thyroiditis?
Thyroid peroxidase antibodies
If you have high thyroglobulin antibody levels and have Graves’ disease, what is likely to happen?
Eventually become hypothyroid
What is most commonly seen antibody in Graves disease?
TSH receptor antibody
What is TSH receptor stimulating antibodies also known as?
TSH stimulating antibodies (TSAb)
Thyroid stimulating Ig (TSI)
When is a radioactive thryoid test done?
Distinguishes between:
Graves
Toxic multinodular goiter
Thyroiditis
What would Graves’ disease look like with a Radioactive Thyroid test? Hashimotos?
Graves: uptake elevated
Hashimotos: Patchy
What do cancerous nodules often look like with a thyroid test?
Cold
