If the thyroid function tests
are normal and ultrasound
shows multiple nodules,the next step i do is FNAC(Fine needle aspiration cytology) test which confirms the nature of the nodules,whether cancerous or not.
Even though there is no cancer in FNAC,it is better to go for surgery,i.e.,Sub total thyroidectomy
as multinodular goitres may turn into cancer.
Wish you good health