Choosing the wrong depression test can do more than produce a bad score - it can send you toward the wrong treatment before you have started. Your age, your symptoms, and your personal history all determine which screening tool will actually give you useful results.
This page breaks down the most common depression assessments. It explains who each one is designed for, what conditions should be met before you take it, and what to do when standard tests do not apply to your situation.
According to the National Institute of Mental Health (NIMH), depression screening is most useful when the right tool is matched to the right person. A test designed for adults may be meaningless for a teenager. A general screening tool may miss symptoms unique to new mothers or older adults.
Before you take any test, read this page first. It could save you from a result that sends you in the wrong direction.
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The Core Eligibility Factors: What Determines Which Test You Should Take
Depression tests are not one-size-fits-all. Four main factors determine which assessment applies to you.
1. Your Age
Age is the first filter. The most widely used screening tool - the PHQ-9 - is normed for adults aged 18 and older. Using it on a 15-year-old produces unreliable results because adolescent depression presents differently than adult depression.
The PHQ-A (Patient Health Questionnaire for Adolescents) was specifically validated for teens aged 13 to 17. It includes an extra item about irritability, which is a common symptom in adolescent depression that the adult version does not capture.
At the other end of the age spectrum, the Geriatric Depression Scale (GDS) was developed for adults aged 65 and older. Older adults often experience depression differently. Fatigue, memory complaints, and loss of interest can overlap with other age-related conditions. The GDS accounts for this overlap.
According to the Patient Health Questionnaire (PHQ) Somatic Symptom Severity Scale - a publicly licensed tool suite developed by Pfizer - each version of the PHQ was validated on specific age populations. Substituting one version for another undermines the validity of the score.
| Age Group | Recommended Tool | Age Range |
|---|---|---|
| Children | Children's Depression Inventory (CDI) | Ages 7-17 |
| Adolescents | PHQ-A | Ages 13-17 |
| Adults | PHQ-9 or BDI-II | Ages 18-64 |
| Older Adults | Geriatric Depression Scale (GDS) | Ages 65+ |
2. Symptom Duration - The Two-Week Rule
Nearly every clinical depression screening tool asks you to reflect on how you have felt over the past two weeks. This is not arbitrary. It comes directly from the diagnostic criteria in the DSM-5.
According to the American Psychiatric Association (APA), a major depressive episode requires symptoms to persist for at least two weeks. Single-day mood crashes or acute grief reactions do not meet this threshold.
This creates an important eligibility consideration. If you are currently in the middle of a crisis - a sudden loss, a medical emergency, or an acute mental health episode - a standard screening score may not reflect your baseline. The score captures your state right now, not your underlying pattern.
The two-week window also works in the other direction. If your symptoms just started three days ago, most screening tools are not yet designed to detect a clinical pattern. A follow-up screening in one to two weeks will give a more accurate picture.
What this means for you: Take a depression screening when you have had at least two weeks of consistent symptoms. Do not take one immediately after a single traumatic event unless you are doing so as a baseline measurement under clinical guidance.
3. Your Specific Condition or Life Stage
Some populations have specialized tools because general screening tests miss condition-specific symptoms.
- Postpartum depression: The Edinburgh Postnatal Depression Scale (EPDS) is the clinical standard for screening after childbirth. New mothers often experience somatic symptoms - fatigue, appetite changes, physical discomfort - that overlap with normal postpartum recovery. The PHQ-9 can over-count these physical symptoms and inflate scores. The EPDS was designed to separate emotional symptoms from physical ones in new mothers.
- General adult depression: The PHQ-9 covers all nine DSM-5 symptom criteria for major depression. It is the most widely used and researched tool in primary care settings.
- Older adults: The Geriatric Depression Scale (GDS) uses a simple yes/no format. This matters for older adults who may have cognitive fatigue or difficulty with scaled ratings. It also excludes somatic questions that can be confounded by physical illness common in aging populations.
- Adolescents: The PHQ-A adds an irritability item not found in the standard adult version. Teens frequently show depression through anger and irritability rather than sadness.
- Children under 13: The Children's Depression Inventory (CDI) covers ages 7 to 17 and includes a parent-report version. Young children often cannot reliably self-report. The parent version helps clinicians get a fuller picture when the child cannot articulate their feelings.
4. Literacy, Language, and Cognitive Capacity
Many depression screening tools assume a certain reading level and degree of self-awareness. This is a real barrier for some users.
The Beck Depression Inventory (BDI-II) uses nuanced language and requires users to select from multiple graduated response options. Individuals with cognitive impairments, limited literacy, or language barriers may find it difficult to complete accurately.
The Hamilton Depression Rating Scale (HAM-D) is administered by a clinician rather than self-reported, which makes it more accessible to individuals who cannot complete written assessments. The trade-off is that it requires a trained evaluator to administer it.
If you have concerns about language or literacy, consider:
- Asking your provider for a translated or simplified version of the PHQ-9, which is available in over 30 languages
- Requesting a clinician-administered tool like the HAM-D rather than a self-report measure
- Using the GDS for older adults, which uses a simple yes/no format and shorter sentences
Source: National Institute of Mental Health (NIMH) maintains recommendations for accessible screening in diverse populations.
Depression Test Types: A Side-by-Side Comparison
With those factors in mind, here is how the most common assessments compare - by purpose, format, and target population.
| Tool | Full Name | Best For | Format | Who Administers |
|---|---|---|---|---|
| PHQ-9 | Patient Health Questionnaire-9 | Adults 18+ | 9-item self-report | Self or clinician |
| PHQ-A | Patient Health Questionnaire for Adolescents | Teens 13-17 | 10-item self-report | Self or clinician |
| PHQ-2 | Patient Health Questionnaire-2 | Quick initial screen | 2-item self-report | Self or clinician |
| BDI-II | Beck Depression Inventory II | Adults 13+ | 21-item self-report | Self |
| HAM-D | Hamilton Depression Rating Scale | Clinical diagnosis confirmation | 17-21 items | Clinician only |
| EPDS | Edinburgh Postnatal Depression Scale | Postpartum / pregnancy | 10-item self-report | Self or clinician |
| GDS | Geriatric Depression Scale | Adults 65+ | 15 or 30 yes/no items | Self or clinician |
| CDI | Children's Depression Inventory | Ages 7-17 | Self-report + parent version | Self or parent |
How to Check Which Test Applies to You
Before choosing any screening tool, work through this decision process.
-
Determine your age group.
Under 7: Standard tools do not apply. A pediatric clinician should evaluate your child directly. Ages 7-12: Use the CDI with a parent-report component. Ages 13-17: Use the PHQ-A. Ages 18-64: Use the PHQ-9 or BDI-II. Ages 65+: Use the GDS.
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Identify your life stage or specific condition.
Are you currently pregnant or recently gave birth? Use the EPDS, not the PHQ-9. Do you have a history of bipolar disorder? Do not use any standard unipolar depression screen. See the FAQ section below for guidance on this.
-
Check your symptom duration.
Have you had consistent symptoms for at least two weeks? If yes, proceed with screening. If your symptoms started within the past few days, wait and monitor. Then screen after two full weeks have passed.
-
Consider your literacy and cognitive capacity.
Can you comfortably read and understand multi-option survey questions? If yes, self-report tools like the PHQ-9 or BDI-II work well. If no, request a clinician-administered tool like the HAM-D.
-
Check for disqualifying conditions.
See the next section for a full list of factors that can invalidate a standard self-test result.
What Can Disqualify a Self-Test Result?
Standard depression screening tools assume an uncomplicated presentation of unipolar depression. Several conditions can make a self-test result invalid or misleading - and knowing about them before you screen matters.
Bipolar Disorder History
The PHQ-9 and BDI-II screen for unipolar (major) depression only. They do not detect mania or hypomania. If you have a history of bipolar disorder, these tools can produce a high score during a depressive episode - but that score does not capture the full picture of your condition.
More importantly, treating bipolar depression the same way as unipolar depression can be dangerous. Antidepressants given without a mood stabilizer can trigger a manic episode. Standard screening tools should not be used to guide treatment decisions in people with known or suspected bipolar disorder.
The Mood Disorder Questionnaire (MDQ) is a better starting point for people who may have bipolar symptoms. A full psychiatric evaluation is the appropriate next step.
Active Psychosis
If you are currently experiencing psychotic symptoms - hearing voices, seeing things that others do not, or having beliefs that feel very real but may not be grounded in shared reality - standard depression screening tools are not appropriate.
Psychosis requires immediate clinical assessment. A self-report depression score cannot capture the severity or nature of a psychotic episode. Go directly to a mental health provider or emergency services if you are experiencing active psychosis.
Substance Use
Alcohol and drug use can mimic depression symptoms - low energy, poor sleep, loss of interest, hopelessness. They can also mask depression symptoms.
If you are currently using substances regularly, a depression screening score may reflect the effects of that substance use rather than an independent depressive disorder. This does not mean your symptoms are not real. It means the test result may not accurately identify the cause.
Tell your provider about substance use before interpreting any screening result. A substance use evaluation may need to happen alongside or before a depression assessment.
Acute Crisis or Recent Trauma
Grief, acute stress reactions, and crisis states produce symptoms that overlap with clinical depression. The PHQ-9 does not distinguish between grief and a major depressive episode.
According to the American Psychiatric Association (APA), the DSM-5 was revised to allow clinicians to diagnose depression even in the context of bereavement - but this requires clinical judgment, not just a screening score.
If you recently experienced a major loss or traumatic event, a high screening score may reflect a normal acute response rather than a clinical disorder. A provider can help you interpret the result in context.
Medical Conditions That Mimic Depression
Hypothyroidism, anemia, vitamin D deficiency, and several other medical conditions produce symptoms that look like depression. Fatigue, low mood, poor concentration, and sleep problems can all have physical causes.
A positive depression screen should be followed by a basic medical evaluation to rule out physical causes. Self-test results alone do not confirm a psychiatric diagnosis.
What If No Standard Test Applies to You?
Not everyone fits the standard screening mold. If you fall outside the typical eligibility criteria, these four options can help.
Option 1: Request a Clinician-Administered Assessment
The Hamilton Depression Rating Scale (HAM-D) is administered by a trained clinician rather than completed by the patient. It does not require reading fluency or the ability to rate your own mood on a numerical scale. A clinician observes your behavior and asks structured questions, then scores the responses.
This is often the best path for individuals with cognitive impairments, severe language barriers, or low literacy levels.
Option 2: Use a Condition-Specific Tool
Pregnant or recently postpartum? Ask your OB or midwife about the Edinburgh Postnatal Depression Scale (EPDS). Adults 65 and older should ask their primary care provider about the Geriatric Depression Scale (GDS). If your child needs screening, the Children's Depression Inventory (CDI) includes a parent version that reduces reliance on child self-report.
Option 3: Pursue a Full Psychiatric Evaluation
Screening tools are not diagnostic. They identify the likelihood of a depressive disorder, but only a qualified clinician can make an actual diagnosis. If you have complex history - bipolar disorder, psychosis, active substance use, or multiple co-occurring conditions - skip the screening tools and go directly to a psychiatric evaluation.
The NIMH maintains resources for finding mental health providers and understanding when a full evaluation is warranted. See the state-by-state resources page for local mental health options.
Option 4: Use a Brief Two-Item Screen First
The PHQ-2 is the shortest version of the PHQ family. It asks only two questions about the core symptoms of depression - low mood and loss of interest. It is often used as an initial filter when a full nine-item screen feels overwhelming or when time is limited.
A positive PHQ-2 result should be followed by the full PHQ-9 or a clinical assessment.
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Understanding What Your Score Means
Screening scores are a starting point, not a diagnosis. Here is how to read results from the most common tools.
PHQ-9 Score Ranges
The PHQ-9 scores range from 0 to 27. Higher scores suggest more severe symptoms. Typical clinical thresholds suggest:
- Scores of 5-9 may indicate mild symptoms worth monitoring
- Scores of 10-14 often prompt clinical follow-up
- Scores of 15 and above typically warrant prompt clinical evaluation
These thresholds are guidelines, not cutoffs. A clinician may treat lower scores or monitor higher ones depending on your full history.
EPDS Scoring Differences
The Edinburgh Postnatal Depression Scale uses different thresholds than the PHQ-9. This matters because new mothers may receive different guidance depending on which tool their provider uses. The EPDS also includes a specific item about self-harm thoughts, which is scored separately from the total.
GDS Yes/No Format
The Geriatric Depression Scale short form contains 15 yes/no questions. A simple response format reduces cognitive burden for older adults. Each answer is scored 0 or 1. The total gives a range from 0 to 15.
BDI-II Nuance
The Beck Depression Inventory (BDI-II) is more detailed than the PHQ-9. Each of its 21 items presents four statements ranked by severity. Respondents choose the statement that best describes how they have felt over the past two weeks. The BDI-II is sensitive to symptom severity and is often used in research and clinical outcome tracking.
Source: Patient Health Questionnaire (PHQ) Somatic Symptom Severity Scale - the PHQ suite, developed by Pfizer and now publicly licensed, includes scoring guidelines for the PHQ-9, PHQ-A, and PHQ-2 at no cost for clinical or research use.
Frequently Asked Questions
Can I take a depression test if I've already been diagnosed with bipolar disorder?
Standard unipolar depression tests like the PHQ-9 are not validated for people with bipolar disorder. During a depressive episode, these tools may produce a high score - but the score cannot distinguish bipolar depression from major depressive disorder. Treating bipolar depression based on a PHQ-9 result alone can be risky. Antidepressants prescribed without mood stabilizers may trigger a manic episode. Instead, ask your provider about the Mood Disorder Questionnaire (MDQ), which screens for bipolar features. A full psychiatric evaluation is the appropriate pathway for anyone with a known or suspected bipolar diagnosis.
Is there a depression test specifically for postpartum or pregnancy-related symptoms?
Yes. The Edinburgh Postnatal Depression Scale (EPDS) is the gold-standard tool for postpartum screening and is also used during pregnancy. It differs from the PHQ-9 in an important way: it excludes somatic questions about sleep, appetite, and fatigue. These physical symptoms are common in all new mothers and can inflate PHQ-9 scores even in women who are not depressed. The EPDS uses different scoring thresholds and includes a specific item about self-harm ideation scored separately. If you recently gave birth or are currently pregnant, ask your OB, midwife, or primary care provider to administer the EPDS rather than a general screening tool.
Do depression tests have a minimum age requirement, and what should parents use for younger children?
The PHQ-9 is not validated for anyone under age 12 and should not be used with children. The Children's Depression Inventory (CDI) covers ages 7 to 17 and is widely used in pediatric clinical settings. It includes a parent-report version for children who cannot reliably self-report - which is common in younger children and those with developmental differences. A separate teacher-report version is also available. According to the NIMH, children under age 7 should be assessed directly by a pediatric mental health clinician rather than using standardized self-report tools. For teens aged 13-17, the PHQ-A is the recommended version.
Can I use the PHQ-9 more than once to track my symptoms over time?
Yes - repeated PHQ-9 administration is a common and accepted clinical practice. Many providers use it at each appointment to track symptom changes over time. To get reliable comparisons, take it under consistent conditions: the same time of day, the same general context, and ideally the same format (paper vs. digital). Scores can fluctuate naturally week to week. A single high score does not confirm a diagnosis, and a single low score does not confirm recovery. Trends over multiple administrations are more meaningful than any one result. Always share your scores with a provider rather than interpreting changes on your own.
What is the difference between the PHQ-2 and the PHQ-9, and when should I use each one?
The PHQ-2 is a two-item rapid screen that asks only about depressed mood and loss of interest - the two core symptoms of depression. It is designed as an initial filter in busy clinical settings where time is limited. A positive PHQ-2 result (typically a score of 3 or higher) indicates that a full PHQ-9 assessment is warranted. The PHQ-9 covers all nine DSM-5 symptom criteria and produces a severity score. If you are screening yourself for the first time and want a quick check, the PHQ-2 can be a starting point. But for any meaningful clinical picture, the PHQ-9 provides far more useful information. Both are part of the publicly licensed PHQ suite developed by Pfizer.
Can a depression screening test replace a diagnosis from a doctor?
No. Screening tools identify the probability that a clinical condition may be present. They are not diagnostic instruments. According to the American Psychiatric Association (APA), a formal diagnosis of major depressive disorder requires a clinician to apply the DSM-5 criteria - which involves ruling out other causes, evaluating symptom duration and impairment, and considering the full clinical picture. A high PHQ-9 score is a strong signal that professional evaluation is needed. It does not by itself confirm a diagnosis. Likewise, a low score does not rule out depression if your symptoms are being underreported or if your symptoms do not fit the typical pattern captured by the test.
About this article
Researched and written by Robert Williams at depression tests. Our editorial team reviews depression tests to help readers make informed decisions. About our editorial process.