PHQ-9 Depression Test: Scoring and Interpretation

The PHQ-9 depression test is a nine-item questionnaire used to screen for depressive symptoms and measure their severity over the previous two weeks. Each item is scored from 0 to 3, producing a total score from 0 to 27. Higher scores indicate a greater burden of depressive symptoms, but the result does not independently establish a diagnosis of depression.

Written by Dr. Taimoor Asghar for taimoorasghar.com.

What is the PHQ-9 depression test?

The Patient Health Questionnaire-9, commonly called the PHQ-9, is a self-report screening instrument developed by Robert L. Spitzer, Janet B. W. Williams, Kurt Kroenke, and colleagues. Its nine questions correspond to core symptoms considered when evaluating depressive disorders.

The questionnaire asks how frequently each symptom has occurred during the past two weeks. It is widely used in primary care, mental-health services, hospitals, research, and follow-up assessments.

The PHQ-9 can help clinicians:

• Identify people who may require a more detailed depression assessment.
• Estimate the current severity of depressive symptoms.
• Track changes in symptoms over time.
• Support conversations about mood, functioning, safety, and treatment response.

It should be interpreted together with a clinical interview, functional assessment, medical history, medication review, and evaluation for other psychiatric or medical explanations.

PHQ-9 questions and response options

The nine items assess the frequency of the following experiences:

1. Reduced interest or pleasure in activities.
2. Feeling depressed, down, or hopeless.
3. Sleep disturbance, including sleeping too little or too much.
4. Low energy or fatigue.
5. Reduced appetite or overeating.
6. Negative feelings about oneself, such as worthlessness or perceived failure.
7. Difficulty concentrating.
8. Noticeably slowed movement or speech, or unusual restlessness.
9. Thoughts of being better off dead or of self-harm.

Each item is assigned a score based on how often it occurred:

An additional unscored question asks how difficult these symptoms have made work, home responsibilities, or relationships. This functional-impact question provides important context even though it is not included in the numerical total.

How to calculate a PHQ-9 score

Add the points assigned to all nine symptom questions:

PHQ-9 total score = item 1 + item 2 + item 3 + item 4 + item 5 + item 6 + item 7 + item 8 + item 9

The lowest possible score is 0, and the highest possible score is 27.

PHQ-9 scoring example

Consider a person whose responses receive the following points:

• Four items scored 0.
• Three items scored 1.
• One item scored 2.
• One item scored 3.

The total would be:

(4 × 0) + (3 × 1) + (1 × 2) + (1 × 3) = 8

A score of 8 falls within the commonly used mild symptom range. However, the interpretation would still depend on which symptoms are present, their duration, associated impairment, safety concerns, and the broader clinical situation.

PHQ-9 score interpretation

The original validation study proposed severity thresholds at scores of 5, 10, 15, and 20. These cutoffs remain commonly used in clinical practice and research.

These categories describe symptom severity rather than proving that a depressive disorder is present. A low score also does not completely exclude clinically important depression, especially when symptoms are underreported, fluctuate over time, or cause disproportionate impairment.

Does a PHQ-9 score diagnose depression?

No. The PHQ-9 depression test is a screening and severity-measurement tool, not a stand-alone diagnostic test.

A diagnosis requires a qualified clinician to evaluate factors such as:

• The pattern, persistence, and duration of symptoms.
• Whether depressed mood or loss of interest is present.
• The degree of distress or functional impairment.
• Previous depressive, manic, or hypomanic episodes.
• Bereavement, trauma, substance use, and psychosocial stressors.
• Medication effects and medical conditions that can mimic depression.
• Psychotic symptoms, anxiety, and other psychiatric conditions.
• Thoughts, plans, intent, or behaviours related to suicide or self-harm.

For example, fatigue, sleep disturbance, poor concentration, and appetite changes may occur with depression but can also be associated with pain, anaemia, thyroid disease, sleep disorders, pregnancy, medication effects, substance use, or other conditions.

Understanding item 9 and suicide risk

Item 9 asks about thoughts of being better off dead or of self-harm. Any response other than “not at all” requires timely follow-up rather than interpretation through the total score alone.

A positive response does not automatically mean that a person intends to attempt suicide. However, it should prompt direct, compassionate assessment of:

• The nature and frequency of the thoughts.
• Whether there is a current plan or intention.
• Access to potentially lethal means.
• Previous self-harm or suicide attempts.
• Recent escalation, substance use, agitation, or severe hopelessness.
• Protective factors and available social support.

A person with immediate intent, a specific plan, recent suicidal behaviour, or an inability to remain safe should receive urgent emergency assistance. The numerical PHQ-9 total must never be used to dismiss a concerning response to item 9.

Using the PHQ-9 to monitor symptoms

Repeated PHQ-9 measurements can help show whether symptoms are improving, worsening, or remaining stable. For meaningful comparison, the questionnaire should ideally be completed under reasonably consistent conditions and at clinically appropriate intervals.

Changes in the score should be considered alongside:

• The person’s own experience of improvement or deterioration.
• Daily functioning at work, school, home, and in relationships.
• Adherence, tolerability, and response to any treatment.
• New stressors, medical problems, or substance use.
• Changes in suicide or self-harm risk.

A change in total score can support clinical decision-making, but treatment should not be continued, stopped, or altered solely because of a questionnaire result.

Important limitations of the PHQ-9

It is based on self-report

Results depend on how a person understands the questions, remembers the previous two weeks, and feels able to disclose sensitive symptoms. Language, literacy, stigma, culture, and the setting in which the questionnaire is completed may affect responses.

Physical symptoms may have other causes

Sleep, appetite, energy, concentration, and movement changes are not specific to depression. Medical illness and medication effects should be considered when clinically relevant.

It does not assess bipolar disorder

A person experiencing depression may have a history of mania or hypomania. The PHQ-9 does not adequately evaluate these episodes, yet identifying them can substantially affect diagnosis and treatment decisions.

Severity categories are not treatment instructions

Two people with the same score may have different symptoms, risks, levels of impairment, preferences, and treatment needs. Management should be individualized rather than determined automatically by the score.

Special populations may require additional care

Interpretation may differ in adolescents, older adults, pregnant or postpartum patients, people with cognitive impairment, and individuals with major medical illness. Validated translations or population-specific assessment pathways should be used where appropriate.

When to speak with a healthcare professional

Professional assessment is appropriate when depressive symptoms persist, interfere with daily life, recur frequently, or cause concern even when the PHQ-9 score is relatively low.

Seek timely clinical support for symptoms such as:

• Persistent sadness, emptiness, or loss of interest.
• Difficulty working, studying, maintaining relationships, or managing self-care.
• Marked sleep, appetite, energy, or concentration changes.
• Severe guilt, worthlessness, agitation, or slowing.
• Possible manic symptoms, psychosis, or harmful substance use.
• Any thoughts of death, suicide, or self-harm.

Urgent emergency help is needed when someone has an immediate intention to self-harm, a specific suicide plan, has recently attempted suicide, or cannot remain safe. Stay with the person when possible, reduce access to dangerous means when this can be done safely, and contact local emergency or crisis services.

Key points about PHQ-9 scoring

• The nine scored questions each receive 0 to 3 points.
• The total score ranges from 0 to 27.
• Common severity thresholds are 5, 10, 15, and 20.
• The pattern of responses and functional impact matter in addition to the total.
• Any positive response to the self-harm item requires appropriate follow-up.
• The PHQ-9 supports assessment but does not replace clinical diagnosis or judgment.

Medical disclaimer: This article is for education only and does not diagnose depression or replace assessment by a qualified healthcare professional. Do not start, stop, or change medication based on a PHQ-9 result without consulting an appropriate clinician. Seek urgent local assistance for immediate suicide or self-harm risk.