The TSH test is primarily used to assess thyroid function by measuring the level of TSH, which is produced by the pituitary gland to regulate thyroid hormone production.

The ACTH stimulation test evaluates the adrenal glands' ability to produce cortisol in response to ACTH, which is produced by the pituitary gland.

The GTT is used to assess glucose metabolism and insulin resistance by measuring blood glucose levels after a glucose challenge.

The Dexamethasone Suppression Test is used to diagnose Cushing's syndrome by evaluating the adrenal glands' response to dexamethasone, a synthetic glucocorticoid.

The ITT is used to assess insulin secretion and sensitivity by measuring insulin levels after an insulin challenge.

The TRH Stimulation Test assesses the pituitary gland's ability to secrete TSH in response to TRH, which is a hormone produced by the hypothalamus.

The HGH Stimulation Test is used to assess growth hormone production by the pituitary gland in response to various stimuli.

The Metanephrines Test measures the levels of metanephrines, which are metabolites of catecholamines produced by pheochromocytoma.

The Prolactin Stimulation Test evaluates the pituitary gland's ability to secrete prolactin in response to various stimuli.

The Aldosterone Stimulation Test evaluates the adrenal glands' ability to produce aldosterone, a hormone involved in regulating blood pressure and electrolyte balance.

The PTH Test measures the level of parathyroid hormone, which is produced by the parathyroid glands and plays a role in calcium and phosphate metabolism.

The Water Deprivation Test assesses the body's ability to concentrate urine and is used to diagnose diabetes insipidus.

The GnRH Stimulation Test evaluates the pituitary gland's ability to secrete LH and FSH in response to GnRH, a hormone produced by the hypothalamus.

The Clonidine Suppression Test evaluates the adrenal glands' ability to produce epinephrine and norepinephrine in response to clonidine, a medication that lowers blood pressure.

The SRS Test uses radioactive tracers to visualize and locate tumors of the endocrine system, such as neuroendocrine tumors.