Treatment for Moderate to Severe Depression

Assessment and Significance of PHQ-9 Score

A PHQ-9 score of 15 indicates moderate to severe depression, requiring immediate attention and professional intervention, as recommended by the American College of Physicians 1, 2
The PHQ-9 score of 15 falls within the moderate to severe range, indicating the presence of most depressive symptoms that interfere moderately to markedly with functioning, according to the American Psychiatric Association 1, 2
Special attention should be given to item 9 of the PHQ-9, which assesses thoughts of self-harm; if present, immediate referral for emergency evaluation is required, as stated by the American Medical Association 1, 3
The PHQ-9 has strong diagnostic validity with a sensitivity of 89.5% and specificity of 77.5% at a cut-off score of 11 for detecting major depressive disorder, as reported by the National Institute of Mental Health 3

Referral to psychology and/or psychiatry for formal diagnosis and treatment planning is strongly recommended for a PHQ-9 score of 15, indicating moderate to severe depression, as advised by the American College of Physicians 1, 2
This level of depression requires high-intensity interventions delivered by licensed mental health professionals, according to the American Psychological Association 4, 1

Individual psychological therapy delivered by licensed mental health professionals is recommended, using treatment approaches that include cognitive behavioral therapy (CBT), behavioral activation, biobehavioral strategies, education, and relaxation techniques, as suggested by the American Psychological Association 4, 1
Behavioral couples' therapy can be considered if the patient has a regular partner and relationship issues may contribute to depression, as recommended by the American Association for Marriage and Family Therapy 4

Regularly reassess PHQ-9 scores to track treatment response, as recommended by the National Institute of Mental Health 3
Do not underestimate the severity of a PHQ-9 score of 15; this represents significant clinical depression requiring professional intervention, as stated by the American Medical Association 3, 2
Avoid failing to assess for risk of self-harm, which requires immediate intervention if present, as advised by the American College of Emergency Physicians 1, 3