A 29-year-old man presents to the PMHNP with a chief complaint of "anxiety related to chronic disorganization." He reports that ever since he was a child, he has had issues with disorganization, inattentiveness, forgetfulness, lack of attention to details. He says these symptoms cause him great anxiety. He says his teachers wanted him to be evaluated for attention deficit-hyperactivity disorder as a child, but his parents refused because he did not have behavioral problems. Which of the following is the most appropriate assessment tool for this client?

Choice A reason: The PHQ-9 is a screening tool for depression. It assesses mood, anhedonia, sleep, appetite, and suicidal ideation but does not evaluate symptoms of inattention or disorganization. Choice B reason: The State-Trait Anxiety Inventory measures anxiety levels but does not assess attentional deficits or executive functioning. It would not help differentiate ADHD from anxiety. Choice C reason: The Adult ADHD Self-Report Scale (ASRS) Symptom Checklist is specifically designed to assess symptoms of adult ADHD, including inattention, disorganization, forgetfulness, and impulsivity. It is the most appropriate tool for evaluating the client’s lifelong symptoms. Choice D reason: The Yale Brown Obsessive Compulsive Scale is used to assess the severity of obsessive-compulsive symptoms. It does not evaluate attentional or executive functioning deficits.