Differentiating different thyroid carcinomas?

I'm a little confused about how to determine what type of thyroid cancer is present in patients. How do we differentiate between the 4 main types (pap, follic, medul, anaplastic) without using a biopsy - i.e. from blood tests, symptoms etc.

Also, how commonly do these carcioma's cause hyperthyroidism?

Authored By Ricky Rimmer on Thursday 25th April 2013