[Thyroid diagnosis 1993].

Functional disorders of the thyroid and thyroidal tumors are a common challenge in daily practice. TSH of the 2nd and the 3rd generation stand in first place of the biochemical parameters in use. The FT4-test serves as confirming investigation. Additional investigations are reserved for special indications. Fine-needle aspiration performed by an experienced endocrinologist has the highest value to determine the benign character of a tumor of the thyroid. Anatomy can be optimally visualized by the modern ultrasound techniques. The most important indication for scintigraphy today is a scheduled therapy with radioactive iodine.