Patient Health Questionnaire-9 (PHQ-9 Depression)
Depressive symptom severity over the last 2 weeks: 9 frequency responses scored 0–3; total 0–27.
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Calculation
Over the last 2 weeks, how often were you bothered by the following: Little interest or pleasure in doing things?
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How it is calculated
Depressive symptom severity over the last 2 weeks: 9 frequency responses scored 0–3; total 0–27.
Formula
Depressive symptom severity over the last 2 weeks: 9 frequency responses scored 0–3; total 0–27.
Limits of the method
Informational translation for self-assessment. Validation of this particular adaptation has not been confirmed. A score does not establish a diagnosis, and a low score does not rule out illness. Any nonzero response to item 9 requires a separate discussion of thoughts of death or self-harm with a professional regardless of the total. Seek urgent help if there is immediate danger.
Sources of the method
This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.
How to use the calculation
Enter the starting values
Depressive symptom severity over the last 2 weeks: 9 frequency responses scored 0–3; total 0–27.
Adjust the parameters
Depressive symptom severity over the last 2 weeks: 9 frequency responses scored 0–3; total 0–27.
Read the result
Informational translation for self-assessment. Validation of this particular adaptation has not been confirmed. A score does not establish a diagnosis, and a low score does not rule out illness. Any nonzero response to item 9 requires a separate discussion of thoughts of death or self-harm with a professional regardless of the total. Seek urgent help if there is immediate danger.
Frequently asked questions
What does the calculation show?
Depressive symptom severity over the last 2 weeks: 9 frequency responses scored 0–3; total 0–27.
What limitations apply?
Informational translation for self-assessment. Validation of this particular adaptation has not been confirmed. A score does not establish a diagnosis, and a low score does not rule out illness. Any nonzero response to item 9 requires a separate discussion of thoughts of death or self-harm with a professional regardless of the total. Seek urgent help if there is immediate danger.
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What next
Formula breakdowns, biomarker reference ranges and nutrition articles with cited sources are in the NutriFit knowledge base.
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