PHQ-9 vs PHQ-2: When the Two-Item Screen Is Enough
PHQ-9 vs PHQ-2 compared: cut-offs, sensitivity, what each one can document, and how the two-step depression screening sequence works in practice.
PHQ-9HEDISFree
Patient Health Questionnaire-9
PHQ-2Free
Patient Health Questionnaire-2
Psychometric Properties
| Metric | PHQ-9 | PHQ-2 |
|---|---|---|
| Sensitivity (major depression) | 88% (cut-off 10) | 83% (cut-off 3) |
| Specificity | 88% | 92% |
| Severity measurement | Five defined bands | None |
| Sensitivity to change | Good (5-point MCID) | Not validated for monitoring |
| Screening efficiency | Moderate | Excellent |
When to Use Each Assessment
Screening every patient at check-in
Two questions, high specificity, and a clear rule for when to continue
Following a positive prescreen
Gives severity, a suicidality item and a score you can document and repeat
Tracking response during treatment
The PHQ-2 has no severity bands and is not validated for monitoring change
HEDIS depression screening and follow-up
Measures require a documented total score from a full instrument
Documenting remission
Remission is defined as a PHQ-9 total below 5 at the follow-up point
Very high-volume medical clinic with limited staff time
Keeps universal screening feasible without losing severity data where it matters
Key Differences at a Glance
- PHQ-2 decides whether to keep asking; PHQ-9 decides what to do
- PHQ-2 has no severity bands and should never be reported as a severity level
- Only the PHQ-9 contains a suicidality item (Item 9)
- Only the PHQ-9 total satisfies depression quality measures and remission documentation
- PHQ-2 is faster and slightly more specific, which is what makes it a good prescreen
The Bottom Line
These are two stages of one workflow, not competing instruments. Ask the PHQ-2 of everyone; when it scores 3 or more, complete the PHQ-9 in the same visit. Only the PHQ-9 gives you severity, a suicidality item, a score usable for quality reporting, and a measure you can repeat to show whether treatment is working.
When to Use Both
Use both, in sequence: PHQ-2 at every routine visit, PHQ-9 whenever the PHQ-2 is 3 or more and at every visit for patients already in treatment for depression.
Choosing between them in practice
PHQ-2 is a two-question prescreen: ask everyone, and if the score is 3 or more, continue. PHQ-9 is the nine-item measure that gives you a severity band, a suicidality item and a score usable for quality reporting and progress monitoring. They are designed to be used together, not chosen between.
Score crosswalk
| Step | Instrument | Result | Next action |
|---|---|---|---|
| 1. Prescreen | PHQ-2 (0-6) | 0-2 | Screen complete; re-screen at the next routine visit |
| 1. Prescreen | PHQ-2 (0-6) | 3-6 | Administer the full PHQ-9 in the same visit |
| 2. Full measure | PHQ-9 (0-27) | 0-9 | Mild or minimal: watchful waiting, repeat in 2-4 weeks |
| 2. Full measure | PHQ-9 (0-27) | 10-19 | Positive: treatment plan and follow-up within 30 days |
| 2. Full measure | PHQ-9 (0-27) | 20-27 | Severe: active treatment, safety assessment, level-of-care review |
| Any step | PHQ-9 Item 9 | 1 or higher | Suicide risk assessment before the patient leaves |
Crosswalks are approximate. Severity bands from different instruments are not interchangeable, so keep one instrument as the measure of record for a given patient.
Switching instruments mid-treatment
- Never report a PHQ-2 score as a severity level. It has no severity bands; it only tells you whether to keep going.
- Do not stop at PHQ-2 for a patient already in treatment. Progress monitoring needs the full nine items so you can see which symptoms are moving.
- PHQ-2 has no suicidality question. If you use it alone, you have no structured suicide-risk item anywhere in the encounter.
- For quality measures, the documented score has to come from the full instrument — a PHQ-2 alone does not satisfy depression screening measures that require a total score.
Evidence notes
- PHQ-2 validation: Kroenke, Spitzer & Williams (2003), Med Care 41(11):1284-1292. Sensitivity 83%, specificity 92% for major depression at a cut-off of 3.
- PHQ-9 validation: Kroenke, Spitzer & Williams (2001). Sensitivity 88%, specificity 88% at a cut-off of 10.
- USPSTF recommends screening all adults for depression where systems exist to ensure accurate diagnosis, treatment and follow-up — the two-step PHQ-2 then PHQ-9 sequence is the most common way to do it.
Frequently asked questions
Is PHQ-2 enough on its own?
Only as a prescreen. A negative PHQ-2 reasonably rules depression out for that visit; a positive one tells you nothing about severity and must be followed by the PHQ-9.
What PHQ-2 score is positive?
3 or more out of 6. Some settings that need higher sensitivity use a cut-off of 2, accepting more false positives in exchange for missing fewer cases.
Which one do quality measures require?
The PHQ-9 total. Depression screening, follow-up and remission measures are built on a documented total score from a full instrument, so the PHQ-9 is what gets recorded.
How often should the PHQ-9 be repeated during treatment?
Every two to four weeks while treatment is being adjusted, then monthly. Remission measures generally look for a PHQ-9 under 5 at a defined follow-up point, so a regular cadence matters for reporting as well as for care.
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