Costovertebral angle tenderness should be assessed whenever the nurse suspects:

Choice A reason: Intelligence cannot be assessed in a 3-month-old, as cognitive abilities are not yet developed enough for evaluation. Sucking and grasping are innate behaviors driven by reflexes, not conscious thought, making this an incorrect assessment focus.

Choice B reason: Cerebral cortex function is immature in a 3-month-old, and sucking and grasping are primarily brainstem-mediated reflexes. These actions do not directly assess higher cortical functions like memory or reasoning, making this an incorrect choice.

Choice C reason: Sucking and grasping in a 3-month-old are primitive reflexes (sucking reflex and palmar grasp reflex), mediated by the brainstem. Assessing these evaluates normal neurological development, making this the correct focus of the nurse’s inquiry.

Choice D reason: While sucking involves Cranial Nerves V, VII, IX, and XII, and grasping involves spinal reflexes, the nurse is assessing the presence of these reflexes, not the cranial nerves directly. Reflex assessment is the primary focus, making this less precise.

Choice A reason: Referred pain originates in one area but is felt elsewhere, not due to abnormal impulse processing. Neuropathic pain involves nerve dysfunction, so this is incorrect for the pain type described.

Choice B reason: Visceral pain arises from internal organs, not nerve processing issues. Neuropathic pain results from abnormal peripheral or central nerve activity, so this is incorrect for the pain mechanism.

Choice C reason: Cutaneous pain is skin-related, caused by direct stimuli, not abnormal nerve processing. Neuropathic pain involves nerve dysfunction, making this incorrect for the described pain type.

Choice D reason: Neuropathic pain results from abnormal pain impulse processing in the peripheral or central nervous system, such as in neuropathy or nerve injury. This matches the description, making it the correct choice.