Depression test — first step toward understanding the situation
If you’ve been wondering whether your feelings could be depression, you’ve already taken an important step. A depression test is a simple tool that helps map out your own symptoms and their intensity. The most commonly used depression tests are PHQ-9 and BDI-21, which are also used in healthcare.
In this article, we go through what these tests measure, how to interpret the results, and what to do based on the results. We also describe the limitations of the test, since self-assessment is useful but doesn’t replace an assessment made by a professional.
Why is it worth taking a depression test?
Depression often creeps in slowly, and recognizing it in yourself can be difficult. Many have become accustomed to a low mood and think “this is just my personality” or “everyone is tired sometimes.”
A depression test helps you stop and examine your own well-being systematically. It can:
- Help put feelings into words that have felt vague
- Show that the symptoms are real and not imagined
- Motivate you to seek help
- Serve as a conversation opener at a professional appointment
PHQ-9 — the most common depression test
The PHQ-9 (Patient Health Questionnaire-9) is the world’s most used depression screening tool. It consists of nine questions based on the diagnostic criteria for depression.
What does PHQ-9 ask?
Each question concerns the past two weeks, and the answer options are:
- 0 = not at all
- 1 = several days
- 2 = more than half the days
- 3 = nearly every day
The questions cover:
- Loss of pleasure or interest
- Low mood or hopelessness
- Sleep difficulties (too much or too little)
- Fatigue or lack of energy
- Appetite changes
- Feeling bad or like a failure
- Difficulty concentrating
- Slow movements or speech, or restlessness
- Thoughts of self-harm
Interpretation of PHQ-9 results
- 0–4 points: No depression or minimal symptoms
- 5–9 points: Mild depression
- 10–14 points: Moderate depression
- 15–19 points: Moderately severe depression
- 20–27 points: Severe depression
A score above 10 indicates that a professional assessment would be beneficial. But even lower scores can be significant if symptoms hinder daily functioning.
BDI-21 — another common depression test
The BDI-21 (Beck Depression Inventory) is a test developed by Aaron Beck, widely used in healthcare. It is somewhat broader than the PHQ-9 and measures the intensity of depression with 21 questions.
Interpretation of BDI-21 results
- 0–13 points: No or minimal depression
- 14–19 points: Mild depression
- 20–28 points: Moderate depression
- 29–63 points: Severe depression
The BDI-21 is copyright protected, so it can’t be freely published online. It can, however, be filled out at a healthcare appointment.
Self-assessment: recognize the signs of depression
The checklist below is based on typical symptoms of depression. This is not a medical test but a tool for understanding your own situation.
Consider whether you have experienced the following over the past two weeks:
- Mood has been low for most of the day, almost every day
- Interest or pleasure in things you previously enjoyed has disappeared
- Fatigue has increased significantly
- Sleep is disrupted — you sleep too little or too much
- Appetite has changed clearly (increased or decreased)
- Concentration is difficult — reading, watching television, or working doesn’t succeed
- You feel worthless or unnecessarily guilty
- Your movement or speech has slowed, or you are more restless than usual
- You have thought about death or self-harm
If you recognize yourself in five or more items and the symptoms have lasted more than two weeks, it’s good to talk about the situation with a professional.
If you have suicidal thoughts, contact a crisis helpline or go to your local emergency services.
What does a depression test result mean?
It’s important to understand what a depression test can and cannot tell you.
What the test tells you
- Gives an overview of the number and intensity of symptoms
- Helps track changes in your well-being over time
- Serves as a useful starting point for a conversation with a professional
What the test doesn’t tell you
- The test doesn’t give a diagnosis — only a healthcare professional can do that
- The test doesn’t distinguish depression from other conditions with similar symptoms (e.g., hypothyroidism, anemia, sleep apnea)
- A single test result doesn’t tell the whole picture — daily energy and mood affect the answers
Depression is a complex whole, and assessing it requires a broader view than a single questionnaire. The test is a good starting point, not an endpoint.
What to do after the test?
If your scores indicate mild depression (PHQ-9: 5–9)
Mild symptoms can be eased with self-care methods. Check the basics:
- Are you sleeping enough?
- Are you exercising regularly?
- Are your social connections in order?
- Are there significant stress factors in your life?
Monitor your well-being and take the test again in a couple of weeks. If symptoms continue or worsen, contact your healthcare provider.
If your scores indicate moderate depression (PHQ-9: 10–14)
Moderate depression usually benefits from professional help. Book an appointment at your healthcare provider or occupational health. A professional will assess your situation and recommend appropriate treatment — often therapy, sometimes medication, or a combination of these.
If your scores indicate severe depression (PHQ-9: 15+)
Don’t delay seeking help. Severe depression is a serious condition that requires professional treatment. Contact your healthcare provider as soon as possible. Self-help programs for depression can support recovery alongside professional help.
Depression test as part of treatment
Depression tests aren’t only one-time screening tools. They are also used during treatment to track progress. Many therapists and doctors ask patients to fill out the PHQ-9 questionnaire at regular intervals.
This helps:
- Show concretely how well-being is changing
- Identify if treatment isn’t working and needs to be changed
- Motivate — it’s rewarding to see scores go down
You can also track your own well-being by taking the test once a month and writing down the results.
When is the test not enough?
There are situations where merely taking the test is not enough and a professional assessment is essential:
- You have suicidal thoughts or plans
- You can’t take care of yourself or basic daily needs
- Symptoms have continued for a long time without relief
- You use alcohol or other substances to manage how you feel
- You suspect that the symptoms could be due to a physical illness
National mental health organizations offer reliable information about recognizing and treating depression.
Need support for depression? Read more.
Getting started is what matters
Taking a depression test can feel scary. What if the scores are high? What does that mean? But taking the test doesn’t change your situation — it just helps you see more clearly where you are.
Knowledge is power. When you know where you stand, you can start to do something about it. That can mean small changes to daily life, a conversation with a loved one, or booking an appointment with a professional.
You can also start a conversation with Aichologist and reflect on your feelings in a safe environment. Sometimes just putting into words what you feel is already a relief.
