Which two pituitary hormones are commonly assessed to evaluate pituitary function?

Which two pituitary hormones are commonly assessed to evaluate pituitary function?

• A. GH and PRL
• B. LH and FSH
• C. Prolactin and Oxytocin
• D. TSH and ACTH

Answer: (D)

Evaluating pituitary function is most informative when you look at hormones that show the pituitary’s control over the major endocrine axes. TSH and ACTH are commonly measured because they provide a straightforward readout of anterior pituitary output to the thyroid and adrenal glands. TSH drives thyroid hormone production, so alongside a thyroid hormone test (free T4) you can assess whether the pituitary is signaling properly to the thyroid. ACTH stimulates the adrenal cortex to produce cortisol, so pairing it with a cortisol test helps gauge the pituitary’s influence on the adrenal axis. Other pituitary hormones can be more variable or influenced by factors such as stress, sex, age, or the menstrual cycle, making them less reliable for a broad screening. Growth hormone is pulsatile and hard to interpret without stimulation tests; prolactin levels can be affected by medications, stress, and other conditions; LH and FSH depend on sex and reproductive status; oxytocin isn’t routinely used for pituitary function testing.

Evaluating pituitary function is most informative when you look at hormones that show the pituitary’s control over the major endocrine axes. TSH and ACTH are commonly measured because they provide a straightforward readout of anterior pituitary output to the thyroid and adrenal glands. TSH drives thyroid hormone production, so alongside a thyroid hormone test (free T4) you can assess whether the pituitary is signaling properly to the thyroid. ACTH stimulates the adrenal cortex to produce cortisol, so pairing it with a cortisol test helps gauge the pituitary’s influence on the adrenal axis.

Other pituitary hormones can be more variable or influenced by factors such as stress, sex, age, or the menstrual cycle, making them less reliable for a broad screening. Growth hormone is pulsatile and hard to interpret without stimulation tests; prolactin levels can be affected by medications, stress, and other conditions; LH and FSH depend on sex and reproductive status; oxytocin isn’t routinely used for pituitary function testing.