The "gold standard" for measuring the severity and type of symptoms in patients with Obsessive-Compulsive Disorder (OCD).
Monitoring response to treatment (Pharmacotherapy or Exposure and Response Prevention - ERP).
Determining the degree of functional impairment related to obsessions and compulsions.
Differentiating between clinical OCD and subclinical intrusive thoughts.
Section 2
Formula & Logic
Scoring Structure
The scale assesses 10 items: 5 for Obsessions (Time, Interference, Distress, Resistance, Control) and 5 matching items for Compulsions. Each is rated 0-4.
Severity Cutoffs
Score 0–7
Subclinical
Score 8–15
Mild
Score 16–23
Moderate
Score 24–31
Severe
Score 32–40
Extreme
Section 3
Pearls/Pitfalls
Resistance vs. Control
Resistance (how hard the patient tries to stop) is often distinct from Control (how successful they are). In late-stage or severe OCD, "Resistance" may drop as the patient becomes exhausted or hopeless, even while "Control" is 0.
Clinical Pearls
A 25% to 35% reduction in Y-BOCS score is generally considered a "clinically significant response" in treatment trials.
Always perform a symptom checklist before the 10-item core assessment to identify the target obsessions/compulsions.
Distinguish between genuine obsessions and "depressive ruminations" or "delusions" which require different therapeutic approaches.
Section 4
Next Steps
Therapeutic Targets
01
Mild (8–15): Consider specialized CBT (specifically ERP) as first-line. SSRI therapy can be adjunctive.
02
Moderate (16–23): Combined ERP and high-dose SSRI (e.g., Fluoxetine 40-80mg, Sertraline 200mg+) is often necessary.
03
Severe (> 24): High risk of profound functional disability. Consider Clomipramine or SSRI augmentation with atypical antipsychotics.
04
Treatment Refractory: If multiple trials fail, evaluate for intensive outpatient or residential OCD programs.
Section 5
Evidence Appraisal
Primary Reference
The Yale-Brown Obsessive Compulsive Scale. I. Development, use, and reliability
Goodman WK et al. • Archives of General Psychiatry. 1989;Vol 46, Issue 11. pp. 1006-1011. The seminal study introducing the Y-BOCS.
Section 6
Literature
Wayne Goodman
Developed by Wayne Goodman and colleagues at Yale University. It transitioned OCD assessment from qualitative "yes/no" checklists to a quantitative measure of symptom burden.
