If your doctor suspects you have thyroid cancer, he or she will feel for a lump in your neck or thyroid or swollen lymph nodes in your neck. Your doctor may also look inside your throat using a flexible tube called a laryngoscope.
To make a thyroid cancer diagnosis, your doctor may order these tests:
Biopsy: Your doctor will remove a small piece of thyroid tissue and examine it for cancerous cells.
Blood tests: This may include a test of your thyroid stimulating hormone (TSH) and free T4 levels, to check your thyroid function.
Fine needle aspiration biopsy: A thin needle is placed into the lump in your neck, and cells are drawn out and then examined under a microscope to look for cancer.
Imaging tests: An ultrasound may be ordered to evaluate the mass and may be used to perform a biopsy.