<prompt> Serum marker used after surgery for differentiated thyroid cancer isT4ThyroglobulinCalcitoninPTH  <response>: Measurement of peripheral Thyroglobulin has predictive value for the recurrence of differentiated thyroid cancer ie papillary and follicular thyroid cancers,locally or in metastatic deposits after initial total thyroidectomy . Basal or stimulated calcitonin levels are sensitive markers for primary or recurrent medullary thyroid cancer. Source : Sabiston 20th edition Pg : 886 