A standard depression screener is an early-warning instrument. It is useful when you feel persistently “off” but cannot yet describe the pattern clearly.
What this assessment does
The tool converts subjective discomfort into observable symptom signals, often around low mood, anhedonia, sleep, energy, appetite, concentration, and guilt/self-worth.
Model logic: from input to output
Input samples symptom frequency across a short period. Output returns a risk/severity band to support next-step decisions: continue observation, start lifestyle intervention, or seek professional care.
Turning score into action
Do not overfocus on a single score. Combine score with function impact: work, study, social connection, and daily self-care. If function is declining, escalation is warranted even when uncertainty remains.
Trend > one-time result
The highest utility comes from repeated measurement and context linkage: sleep changes, stress events, physical illness, and medication shifts.
Scientific boundaries
Screening does not equal diagnosis. Use this tool as a decision aid and communication bridge, not as a final judgment about identity or worth.
References
[1] Kroenke, K., Spitzer, R. L., & Williams, J. B. W. (2001). The PHQ-9. [2] Kroenke, K., Spitzer, R. L., & Williams, J. B. W. (2003). The PHQ-2.