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TRH stimulation test. Prior to the availability of sensitive TSH assays, thyrotropin releasing hormone (TRH) stimulation tests were relied upon for confirming and assessing the degree of suppression in suspected hyperthyroidism. Typically, this stimulation test involves determining basal TSH levels and levels 15 to 30 minutes after an intravenous bolus of TRH.
PTH stands for parathyroid hormone. It is a protein hormone released by the parathyroid gland. The parathyroid glands are located in the neck, near or attached to the back side of the thyroid gland. Parathyroid hormone controls calcium, phosphorus, and vitamin D levels in the blood and bone.