A 23-year-old female client is being evaluated for symptoms of depression. The PMHNP conducting her psychiatric evaluation will administer which of the following tools to determine the client's level of depression at baseline, during, and at the end of treatment?

Choice A reason: The Beck Depression Inventory is a self-report questionnaire that measures the severity of depressive symptoms. It is useful for initial screening and research but is less commonly used in routine clinical practice for repeated assessment during treatment monitoring due to its length and scoring requirements. Choice B reason: The Hamilton Depression Rating Scale is clinician-administered and measures depression severity. While it is thorough and reliable, it is primarily used in research settings and psychiatric facilities rather than in routine clinical follow-up due to its complexity. Choice C reason: The Beck Hopelessness Scale specifically measures pessimism and hopelessness rather than general depressive symptom severity. It is not suitable as a standalone tool for tracking overall depression treatment progress. Choice D reason: The Patient Health Questionnaire-9 is a brief, validated, self-administered tool used to assess depressive symptom severity over time. It is ideal for baseline assessment, monitoring response to treatment, and measuring outcomes at treatment completion, making it the most practical and widely used tool in clinical practice.