A nurse is discussing antidepressants with a newly licensed nurse. Which of the following clients should the nurse identify as being a candidate for antidepressant therapy?

Rationale: A. A client who has decreased interleukin-6 levels: Interleukin-6 is a pro-inflammatory cytokine that may be elevated in depression, but its decrease is not an indicator for antidepressant use. It’s not routinely used to determine the need for antidepressant therapy in clinical practice. B. A client who has decreased urine cortisol levels: Depression is more commonly associated with increased cortisol levels due to stress responses. Low cortisol may be seen in conditions like Addison's disease but does not typically guide antidepressant use. C. A client who has decreased C-reactive protein levels: CRP is a nonspecific inflammatory marker. While elevated CRP has been observed in some individuals with depression, a decreased CRP level would not indicate the need for antidepressant therapy. D. A client who has decreased serotonin levels: Low serotonin levels are closely linked to depression pathophysiology. Many antidepressants, such as SSRIs, target serotonin levels to relieve depressive symptoms, making this the most relevant indicator for antidepressant therapy.