Intraoperative parathyroid hormone (PTH) dynamics during parathyroidectomy for sporadic primary hyperparathyroidism in two successfully treated patients

(A) The pre-excision PTH level has increased when compared with the pre-incision sample due to manipulation of the abnormal gland during dissection. In this case, if the pre-excision sample was not collected, the intraoperative parathyroid hormone monitoring (IPM) criterion would not have been met in 10 minutes.

(B) The pre-excision PTH level has already decreased when compared with the pre-incision sample due to early devascularization of the abnormal gland. In this case, if the pre-incision sample was not collected, the IPM criterion would not have been met in 10 minutes.