[Use of combined radionuclide tests in the differential diagnosis of different forms of thyroid cancer].

The levels of TSH, T4, T3, calcitonin (CT), PTH, TGA and TG were determined in 96 persons (87 patients and 9 healthy persons) before and after operation; 46 patients had papillary carcinoma, 15 follicular cancer, 24 medullary carcinoma, 2 undifferentiated cancer. There was no common clinicomorphological approach to the studied problem therefore it was impossible to compare the data of different researchers. Radionuclide tests were employed to specify the importance of different methods in clinical practice. Elevated levels of TG, TSH, PTH, T4 and a lowered level of CT were revealed in differentiated thyroid carcinomas; elevated levels of CT, TSH, PTH, T4 and a lowered level of TG were revealed in medullary carcinoma. A decrease in T4 and T3 levels was noted after operations in patients with differentiated thyroid cancers necessitating the use of substitution therapy and thyroid hormones.