A client presents to the clinic with complaints of fatigue, anhedonia, and hypersomnolence. Which action is the psychiatric mental health nurse practitioner's priority?

Choice A reason: The clinical priority in any psychiatric evaluation is to rule out organic or medical causes for psychological symptoms. Fatigue, anhedonia, and hypersomnolence are common signs of depression, but they also mirror medical conditions like anemia (checked via CBC), hypothyroidism (checked via TSH), or substance use (checked via toxicology). Diagnosing a psychiatric disorder without ruling out these physiological causes is a safety risk. Choice B reason: While cognitive behavioral therapy (CBT) is an evidence-based treatment for depression, it is not the priority action. Behavioral interventions should follow a definitive diagnosis. If the patient's fatigue is caused by a medical issue like severe anemia, therapy will not address the underlying physiological deficit that is causing the presenting symptoms. Choice C reason: Prescribing a serotonin reuptake inhibitor (SSRI) before ruling out medical causes is inappropriate. If the client's symptoms are secondary to a medical condition or drug use, the SSRI may be unnecessary or lead to delayed treatment of the true cause. Furthermore, SSRIs require an accurate diagnosis of a depressive or anxiety disorder to be indicated. Choice D reason: While the PMHNP may collaborate with a primary care provider, the PMHNP has the authority and clinical responsibility to order and interpret basic laboratory tests as part of the initial psychiatric assessment. Referring the client out before initiating basic diagnostic screening unnecessarily delays the assessment process and the development of an appropriate treatment plan.