Library.
3 verifications about Patient Health Questionnaire-9 Patient Health Questionnaire-9 ×
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Mostly False 4/10
“A Patient Health Questionnaire-9 (PHQ-9) score of 10 or higher indicates that clinical depression is present.”
A PHQ-9 score of 10 or higher is best understood as a positive depression screen, not a confirmed diagnosis. Research supports it as a common cutoff that suggests possible major depression and warrants clinical evaluation, but authoritative guidance says depression should not be diagnosed solely from that score. The claim overstates what the number alone can establish.
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True 10/10
“Symptoms assessed by the Patient Health Questionnaire-9 (PHQ-9) can overlap with symptoms caused by other health conditions.”
The claim is well supported. Multiple high-quality clinical and research sources show that some PHQ-9 symptoms, particularly somatic ones such as fatigue, sleep problems, and appetite change, can also be caused by other medical conditions. That is why PHQ-9 results are typically interpreted alongside clinical assessment rather than in isolation.
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True 9/10
“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.”
The evidence strongly supports the claim. Multiple high-quality studies and clinical guidelines show that common medical conditions, multimorbidity, and medication burden can raise PHQ-9 scores to 10 or higher because the questionnaire captures symptoms that are not unique to major depression. A PHQ-9 score at or above 10 is therefore a screening signal, not proof of depressive disorder.