Mental Health Self-Assessment Guide: PHQ-9, GAD-7, and Clinical Thresholds

Self-assessment questionnaires are widely used in primary care, clinical psychiatry, and telemedicine to screen for symptoms of depression and anxiety. Standardized instruments such as the PHQ-9 (Patient Health Questionnaire) and GAD-7 (Generalized Anxiety Disorder Screener) convert self-reported emotional and physical symptoms into objective numerical scores that assist healthcare providers in evaluating symptom severity over time.

Primary Clinical Screening Tools

Primary care physicians and behavioral therapists rely on two primary validated screening questionnaires:

1. PHQ-9 (Depression Screening)

The PHQ-9 evaluates the presence and frequency of 9 DSM-5 diagnostic criteria for major depressive disorder experienced over the preceding two weeks:

• Little interest or pleasure in doing things (anhedonia)
• Feeling down, depressed, or hopeless
• Sleep disturbances (insomnia or hypersomnia)
• Fatigue or lack of energy
• Appetite alterations (poor appetite or overeating)
• Feelings of worthlessness or excessive guilt
• Concentration difficulties
• Psychomotor agitation or retardation
• Passive or active thoughts of self-harm

Each item is scored from 0 (Not at all) to 3 (Nearly every day), yielding a total possible score from 0 to 27.

2. GAD-7 (Anxiety Screening)

The GAD-7 measures the frequency of 7 common symptoms of generalized anxiety disorder over the prior two weeks:

• Feeling nervous, anxious, or on edge
• Inability to stop or control worrying
• Worrying excessively about different things
• Trouble relaxing
• Restlessness or being unable to sit still
• Becoming easily annoyed or irritable
• Feeling afraid as if something awful might happen

Scores range from 0 to 21 based on symptom frequency.

Interpreting Score Tiers: What the Numbers Mean

Both instruments group total scores into standardized clinical severity brackets:

Worked Numeric Example: Patient Screening Assessment

Consider an individual evaluating workplace stress and emotional exhaustion over the prior two weeks:

• PHQ-9 Responses:

  • Anhedonia: More than half the days (+2)
  • Depressed mood: Several days (+1)
  • Insomnia: Nearly every day (+3)
  • Fatigue: Nearly every day (+3)
  • Appetite changes: Several days (+1)
  • Guilt: Not at all (0)
  • Concentration difficulty: Several days (+1)
  • Psychomotor changes: Several days (+1)
  • Self-harm ideation: Not at all (0)
  • Total PHQ-9 Score: $2 + 1 + 3 + 3 + 1 + 0 + 1 + 1 + 0 = \mathbf{12}$ (Moderate Depression Tier)

• GAD-7 Responses:

  • Nervousness: Several days (+1)
  • Uncontrolled worry: More than half the days (+2)
  • Excessive worry: Several days (+1)
  • Trouble relaxing: Several days (+1)
  • Restlessness: Not at all (0)
  • Irritability: Several days (+1)
  • Dread/fear: Several days (+1)
  • Total GAD-7 Score: $1 + 2 + 1 + 1 + 0 + 1 + 1 = \mathbf{7}$ (Mild Anxiety Tier)

Interpretation: The combined score profile (PHQ-9 of 12 and GAD-7 of 7) indicates moderate depressive symptoms with mild generalized anxiety. The prominent sleep disruption and chronic fatigue suggest that scheduling an appointment with a primary care physician or licensed counselor is warranted to explore contributing medical and psychological factors.

Critical Honesty: Screening Is Never a Diagnosis

[!IMPORTANT] No-Diagnosis Policy: Self-administered screening scores provide a structured symptom summary—they never constitute a medical, psychiatric, or psychological diagnosis. Only a qualified, licensed physician, clinical psychologist, or psychiatrist performing an in-depth clinical interview can evaluate differential diagnoses (such as thyroid disorders, anemia, vitamin deficiencies, medication side effects, or situational adjustment reactions).

Emergency and Crisis Resources

If you, a family member, or a friend are experiencing severe distress, overwhelming despair, or thoughts of self-harm, immediate professional help is available 24 hours a day:

• United States & Canada: Call or text 988 to reach the Suicide & Crisis Lifeline (free, confidential, 24/7).
• Crisis Text Line: Text HOME to 741741 to connect with a crisis counselor.
• United Kingdom: Call 111 (NHS mental health services) or call the Samaritans at 116 123.
• International: Visit Befrienders Worldwide or findahelpline.com to find immediate local crisis centers.

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