The Claim

The Patient Health Questionnaire-9 (PHQ-9) does not incorporate a patient's current medications or laboratory test results when assessing depressive symptoms.

Verified by Lenz · Aug 3, 2026

The Short Version

The evidence shows the PHQ-9 is a nine-question self-report tool that scores only symptom frequency. Standard PHQ-9 forms and scoring instructions do not include current medications or laboratory results. Those factors may matter in a full clinical workup for depression, but they are evaluated separately from the PHQ-9 itself.

Caveats

Do not confuse the PHQ-9 instrument with the full clinical assessment for depression; medication review and lab testing can still be important outside the questionnaire.
The PHQ-9 is a screening and severity measure, not a complete diagnostic process by itself.
Some clinical workflows or electronic systems may display PHQ-9 results alongside other patient data, but that does not make those data part of the PHQ-9 scoring method.

The Receipts

Major Depressive Disorder in Adults - Diagnosis and Treatment
Gov.bc.caNov 1, 2022
The PHQ-9: Validity of a Brief Depression Severity Measure
PubMed CentralSep 1, 2001
Use of the Patient Health Questionnaire (PHQ-9) in Practice
PMCOct 13, 2020
Patient Health Questionnaire-9 (PHQ-9)
University of Washington HIV Web Study
PHQ-9 Instructions
Blue Cross of Idaho
Administering the Patient Health Questionnaires 2 and 9 (PHQ 2 and 9) in Integrated Care Settings
New York State Department of Health
Patient Health Questionnaire (PHQ-9) – How to Score the PHQ-9
Government of British Columbia
Patient Health Questionnaire-9 (PHQ-9)
CentAUR (University of Reading)
The Patient Health Questionnaire-9 for detection of major depression in primary care
PubMed CentralSep 1, 2001
Patient Health Questionnaire (PHQ-9 & PHQ-2)
American Psychological Association

+ 18 more sources — see the full list on Lenz

Filed Under

Patient Health Questionnaire-9

The Patient Health Questionnaire-9 (PHQ-9) does not incorporate a patient's current medications or laboratory test results when assessing depressive symptoms.

The Short Version

Caveats

The Receipts

Filed Under

More Fact Checks

A Patient Health Questionnaire-9 (PHQ-9) score of 10 or higher indicates that clinical depression is present.

Symptoms assessed by the Patient Health Questionnaire-9 (PHQ-9) can overlap with symptoms caused by other health conditions.

Numerous medical conditions and polypharmacy (use of multiple medications) combinations, many of which are common, can contribute to Patient Health Questionnaire-9 (PHQ-9) scores of 10 or higher.