Mental Health Screening Tools: PHQ-9, GAD-7, PCL-5, AUDIT, and MDQ

Validated screening questionnaires give you a structured way to describe what you are experiencing, but they are self-assessments and educational aids, not diagnoses. Each tool measures a specific area, and your results are a starting point for a conversation with a clinician, who is the only one who can diagnose a condition.

A screen is not a substitute for urgent help. If you are in danger or considering self-harm, contact local emergency services or a crisis line now (in the US call or text 988, or use your local equivalent).

What Each Tool Measures

• PHQ-9. A nine-item questionnaire measuring the severity of depression symptoms over the past two weeks; one item asks about thoughts of self-harm.
• GAD-7. A seven-item questionnaire measuring the severity of generalised anxiety symptoms.
• PCL-5. A checklist that screens for symptoms of post-traumatic stress disorder in line with current diagnostic criteria.
• AUDIT. The Alcohol Use Disorders Identification Test, which screens for risky or harmful alcohol use.
• MDQ. The Mood Disorder Questionnaire, which screens for symptoms that may suggest a bipolar spectrum condition.

How Scoring Works

Each tool converts your answers into a score that falls into a severity range, for example minimal, mild, moderate, or severe. A higher score suggests more symptoms, not a confirmed condition. These instruments are validated, meaning research supports their reliability and consistency, but they are designed to flag areas worth exploring rather than to label you. Screens can produce false positives and false negatives, which is why professional evaluation matters, and why a low score does not always mean nothing is wrong if you feel unwell.

From Results to Next Steps

1. Minimal or low scores. Keep an eye on how you feel and re-screen if things change.
2. Mild scores. Consider self-help, lifestyle steps, and monitoring; talk to a clinician if symptoms persist.
3. Moderate to severe scores. Book an appointment with a clinician to discuss a full evaluation and treatment options.
4. Any thoughts of self-harm. Seek help promptly, and urgently if you feel unsafe.

Why It Is Not a Diagnosis

A diagnosis requires a clinical evaluation that considers your history, context, physical health, and how symptoms affect your life, along with ruling out other causes such as thyroid problems or medication effects. Screening tools cannot do this. They are a valuable bridge that helps you and your clinician start from concrete information and track change over time as treatment progresses.

Making Screening Useful

To get the most from a screen, answer honestly based on how you have genuinely felt over the stated period, usually the past two weeks. Keep your results so you can compare over time, and bring them to appointments. If your situation is complex, or you have several concerns at once, a clinician can help interpret what the scores mean together rather than in isolation.

Why Screening Matters

Many mental health conditions go unrecognised for years because symptoms build slowly or are mistaken for stress, personality, or physical illness. Routine screening helps catch problems earlier, when treatment tends to be simpler and more effective. It also gives you language for what you are experiencing, which can make it easier to ask for help and to explain your situation to a clinician. For conditions that are often missed, such as bipolar spectrum symptoms picked up by the MDQ, a screen can prompt an evaluation that changes the treatment plan significantly.

Frequently Asked Questions

Are these tools accurate?

They are validated and widely used, but no screen is perfect. They indicate likelihood and severity, and a clinician confirms any diagnosis.

How often should I screen?

Re-screening every few weeks is useful when monitoring symptoms or tracking whether a treatment is working. Your clinician can advise on timing.

What should I do with my results?

Share them with a clinician, especially if scores are moderate or higher, or if any item about self-harm applies to you.

Can a screen tell me which condition I have?

No. Each tool measures one area and suggests where to look further. Only a clinical evaluation can determine a diagnosis.

Are my screening answers private?

Treat your results as personal health information and share them only with a clinician or people you trust. A completed screen is most useful when you bring it to a professional who can help interpret it.