Final answer:
The nurse should seek further evaluation of the endocrine gland function of the posterior pituitary and testes due to fluid secretions from the nipple.
Step-by-step explanation:
The nurse should seek further evaluation of the endocrine gland function of the posterior pituitary and testes when a male client reports fluid secretions from the nipple. This is because the posterior pituitary gland is responsible for releasing the hormone oxytocin, which plays a role in milk letdown during breastfeeding. The testes, on the other hand, produce testosterone, which can lead to breast secretions in rare cases.