In hypopituitarism, which anterior pituitary hormone is typically decreased?

In hypopituitarism, which anterior pituitary hormone is typically decreased?

• A. ADH
• B. Oxytocin
• C. TSH
• D. Melanocyte-stimulating hormone

Answer: (C)

Hypopituitarism means the anterior pituitary isn’t secreting its hormones adequately. Thyroid-stimulating hormone is a classic example of an anterior pituitary hormone that falls with pituitary failure, so its decrease directly explains secondary hypothyroidism: the thyroid is under-stimulated despite normal hypothalamic signals. The other hormones listed aren’t the anterior pituitary’s main players in this scenario: ADH and oxytocin come from the posterior pituitary and are released under hypothalamic control, not from the anterior lobe. Melanocyte-stimulating hormone is a minor product and not a primary diagnostic marker of anterior pituitary failure. Thus, TSH is the best answer because it directly reflects anterior pituitary dysfunction.

Hypopituitarism means the anterior pituitary isn’t secreting its hormones adequately. Thyroid-stimulating hormone is a classic example of an anterior pituitary hormone that falls with pituitary failure, so its decrease directly explains secondary hypothyroidism: the thyroid is under-stimulated despite normal hypothalamic signals. The other hormones listed aren’t the anterior pituitary’s main players in this scenario: ADH and oxytocin come from the posterior pituitary and are released under hypothalamic control, not from the anterior lobe. Melanocyte-stimulating hormone is a minor product and not a primary diagnostic marker of anterior pituitary failure. Thus, TSH is the best answer because it directly reflects anterior pituitary dysfunction.