Y-BOCS
Yale-Brown Obsessive Compulsive Scale
Ten-item clinician-administered severity measure for OCD — the gold-standard outcome measure.
The Y-BOCS (Yale-Brown Obsessive Compulsive Scale) is the gold-standard severity measure for obsessive-compulsive disorder, developed by Wayne Goodman and colleagues (1989). It is clinician-administered, takes about 20 minutes, and is the outcome measure of choice in virtually every OCD treatment trial of the past three decades.
What it measures
Five items each on obsession and compulsion severity: time spent, interference, distress, resistance, and control. Time and interference items typically carry the most weight in treatment-tracking.
Scoring and bands
Cutoffs
Clinical OCD typically scored ≥16. Treatment response often defined as ≥35% reduction; remission as <12 plus minimal interference.
How to talk about the score
Y-BOCS is detailed — share cluster scores (obsession vs. compulsion subtotals) and the time-spent item separately. Many clients are struck by seeing the daily time-cost quantified.
Limitations
- Clinician-administered (more burden than self-report)
- Requires familiarity with OCD presentations to score accurately
- Self-report versions exist (Y-BOCS-SR) but are less standardized
- Doesn't capture all OCD subtypes equally well (e.g., mental compulsions can be under-detected)
Best used for
- OCD severity assessment
- ERP treatment outcome tracking
- Research and trial standardization
The Y-BOCS items
Over the last two weeks, how often have you been bothered by the following problems?
- Time spent on obsessions(Obsession item 1)
- Interference from obsessions
- Distress from obsessions
- Resistance against obsessions
- Degree of control over obsessions
- Time spent on compulsions(Compulsion item 1)
- Interference from compulsions
- Distress from compulsions
- Resistance against compulsions
- Degree of control over compulsions
Y-BOCS scoring — obsessions, compulsions, and total
Each of the 10 items is rated 0 (none) to 4 (extreme). Items 1–5 produce the obsession subtotal (0–20), items 6–10 the compulsion subtotal (0–20), and the total ranges 0–40. Bands: 0–7 subclinical, 8–15 mild, 16–23 moderate, 24–31 severe, 32–40 extreme. A score of ≥16 is the typical clinical threshold.
Y-BOCS treatment response and remission
A reduction of ≥35% from baseline is the standard 'treatment responder' benchmark used in ERP and pharmacotherapy trials. Remission is typically defined as a total score below 12 plus minimal functional interference. Track the time-spent and interference items separately — they tend to move first as ERP takes hold.
Y-BOCS vs Y-BOCS-SR (self-report)
The original Y-BOCS is clinician-administered with structured prompts. The Y-BOCS-SR is a self-report adaptation that correlates strongly with the clinician version and is reasonable for between-session tracking. For diagnosis and initial severity rating, the clinician version is preferred because mental compulsions and atypical obsessions often need clarifying questions to score accurately.
CY-BOCS for children
The Children's Yale-Brown Obsessive Compulsive Scale (CY-BOCS) is the validated adaptation for ages 6–17. It uses the same 10-item structure and 0–4 anchors but with age-appropriate language and parent-report integration.
Frequently asked questions about the Y-BOCS
Can clients fill out the self-report version themselves?
Yes — the Y-BOCS-SR is available and reasonable for tracking. The clinician version is preferred for diagnosis and initial assessment because clarifying questions matter.
What's a meaningful change?
≥35% reduction in total score is the typical treatment-response benchmark in ERP trials.
How long does the Y-BOCS take?
About 15–20 minutes for the clinician-administered version once you are familiar with it. The Y-BOCS-SR takes a client roughly 10 minutes.
Is the Y-BOCS free to use?
The scale is freely available for clinical and research use; commercial use requires permission from the authors via the Yale University copyright holder.
What is a 'clinical' Y-BOCS score?
A total score of 16 or higher is the conventional clinical threshold for OCD severity warranting active treatment. Scores of 8–15 may still benefit from intervention depending on functional impact.