[On thyroid phosphatase in human serum (author's transl)].

Patients with hyperthyreoidism often present an increased activity of alkaline phosphatase in serum. Determination of isoenzymes may help to assign to different organs an elevated enzyme-activity in serum. This report deals with a patient suffering from hyperthyreoidism. In his serum alkaline phosphatase of the thyroid gland could be identified by comparison with organ-extracts. Raised activity of this isoenzyme can contribute besides bone, liver and small bowel to the increased serum-activity of total alkaline phosphatase in patients with hyperthyreoidism.