Minimum Duration of Symptoms for Major Depressive Disorder Diagnosis
To diagnose major depressive disorder (MDD), symptoms must be present for at least 2 weeks. 1, 2, 3
Core Diagnostic Requirement
The DSM-5 requires that ≥5 of 9 specific symptoms persist for ≥2 weeks minimum, representing a change from prior functioning. 2
At least one of these symptoms must be either:
The Nine Symptom Criteria
The complete symptom set includes 2, 3:
- Depressed mood or irritability
- Anhedonia (loss of interest/pleasure)
- Significant weight or appetite change
- Sleep disturbance (insomnia or hypersomnia)
- Psychomotor agitation or retardation
- Fatigue or loss of energy
- Feelings of worthlessness or excessive/inappropriate guilt
- Diminished concentration or indecisiveness
- Recurrent thoughts of death or suicidal ideation
Additional Mandatory Criteria Beyond Duration
Beyond the 2-week threshold, you must verify 2, 3:
Functional impairment: Symptoms cause clinically significant distress or impairment in social, occupational, or other important functioning domains 2
Exclusion of medical causes: Symptoms are not attributable to substances or another medical condition 2
Exclusion of other psychiatric explanations: Symptoms are not better explained by bereavement or another psychiatric disorder 2
Important Clinical Caveats
The 2-week criterion may not capture all clinically significant cases, particularly in young children. Research in preschoolers demonstrates that children meeting all MDD criteria except the 2-week duration still exhibit clinically significant depression with similar 2-year outcomes as those meeting full duration criteria. 4 However, the standard diagnostic threshold remains 2 weeks across all age groups in current guidelines. 1, 2, 3
Duration alone is insufficient for diagnosis—you must also document functional impairment and systematically exclude medical etiologies (pain, fatigue, delirium, infection, electrolyte disturbances) before confirming MDD. 2