Y-BOCS Symptom Checklist (Y-BOCS-SC)

Abstract

The Yale-Brown Obsessive Compulsive Symptom Checklist (Y-BOCS-SC) is a structured, clinician-rated inventory designed to systematically catalogue the presence of specific symptoms associated with Obsessive-Compulsive Disorder (OCD). Serving as the initial component of the full Y-BOCS assessment, the checklist guides a structured clinical interview to establish the patient’s phenomenological profile.

The Y-BOCS-SC comprises 55 distinct items covering the full range of obsessive and compulsive subtypes. It requires the clinician to distinguish between symptoms experienced in the past and those currently active (within the last seven days). This detailed mapping is crucial for determining specific target symptoms for subsequent therapeutic intervention.

Keywords

Y-BOCS-SC, OCD, Obsessions, Compulsions, Symptom checklist, Clinician-rated scale, Psychometrics, Yale-Brown, Structured interview.

Authors

Wayne K. Goodman, Lewis H. Price, Steven A. Rasmussen, Pamela L. Riddle, Steven L. Rapoport.

Purpose

The primary purpose of the Y-BOCS-SC is to systematically identify the breadth and nature of specific obsessions and compulsions experienced by an individual diagnosed with or suspected of having OCD. This tool ensures comprehensive exploration of all major symptom categories relevant to the disorder during the diagnostic and assessment phase.

By determining which symptoms are currently active versus those experienced previously, the Y-BOCS-SC effectively establishes the target symptoms upon which subsequent treatment strategies, such as Exposure and Response Prevention (ERP) within Cognitive Behavioral Therapy (CBT), will be based. The output provides a highly individualized clinical picture, far more detailed than a simple severity rating alone.

Construct

The Y-BOCS-SC measures the clinical phenomenology of Obsessive-Compulsive Disorder (OCD) by assessing the presence of its two defining core constructs: obsessions and compulsions. Obsessions are operationalized as intrusive, unwanted thoughts, images, or urges that cause significant distress or anxiety.

Compulsions are defined as repetitive mental or behavioral acts performed in response to an obsession or according to rigid rules, aimed at reducing anxiety or preventing a feared outcome. The checklist further delineates these symptoms into clinically recognized subtypes, including contamination, aggressive, sexual, religious (scrupulosity), symmetry/exactness obsessions, and corresponding cleaning, checking, repeating, and ordering compulsions.

Validity

As a symptom inventory, the validity of the Y-BOCS-SC is strongly linked to the overall psychometric rigor of the full Y-BOCS. The items demonstrate high content validity, as they were derived from extensive clinical observation and are structured to capture the full spectrum of OCD presentations described in diagnostic criteria.

The structured interview format, which relies on the clinical judgment of the interviewer, enhances face validity and criterion validity. The checklist’s ability to accurately identify and categorize symptoms ensures strong concurrent validity when compared against other established diagnostic instruments for OCD.

Reliability

The reliability of the Y-BOCS-SC is primarily ensured through its standardized, structured interview administration and the requirement for trained clinicians. The clear, categorical scoring system (Past vs. Current) minimizes subjective interpretation in identifying symptom presence.

Studies focusing on the full Y-BOCS, which incorporates the symptom checklist, consistently report excellent inter-rater reliability, demonstrating that different trained clinicians can reliably agree on the presence and classification of the patient’s specific obsessions and compulsions.

Factor Analysis

Factor analytic studies utilizing the symptom dimensions captured by the Y-BOCS-SC items consistently support a multi-dimensional model of OCD, rather than a unitary construct. These analyses typically cluster the items into empirically derived symptom groups.

The most frequently replicated factors include: 1) Contamination and Cleaning, 2) Harm Avoidance (Aggressive, Sexual, Religious Obsessions, and Checking Compulsions), 3) Symmetry and Ordering, and 4) Hoarding. The structure of the Y-BOCS-SC facilitates the identification of these specific symptom clusters, which are critical for understanding the underlying heterogeneity of the disorder.

Instrument

Test Type: Clinician-rated Checklist/Structured Interview Guide

Format: Structured interview checklist consisting of 55 items, rated for presence (Past or Current).

Language Available: English (Original), widely translated.

Population Group: Clinical populations diagnosed with Obsessive-Compulsive Disorder (OCD).

Age Group: Adolescents (typically 12+) and adults.

Population Details: Utilized in psychiatric and clinical settings for comprehensive assessment of OCD phenomenology.

Test Methodology: The clinician informs the patient about the distinction between obsessions and compulsions. Symptoms are marked as “Past” (experienced previously, but not in the last 7 days) or “Current” (experienced in the last 7 days). The final rating integrates the patient’s report with the clinician’s judgment. A total score ranging from 0 to 110 can be calculated (1 point for Past, 2 points for Current).

Keywords

Contamination, Checking, Hoarding, Scrupulosity, Symmetry, Clinical assessment, Psychopathology, Y-BOCS, Structured interview, Treatment planning.

Authors

Author ORCID Identifier: N/A

Affiliation Email addresses: N/A (Refer to original publishing institution)

Correspondence Address: Refer to original publication: Goodman, W. K., Price, L. H., Rasmussen, S. A., et al. (1989), New Haven, CT.

Permissions & Fee and Test Year

Test Year: 1989

Permissions & Fee: The Y-BOCS and its symptom checklist are generally accessible for non-commercial research and clinical use. For commercial applications or formal licensing, users should contact the scale authors or the associated academic institution (Yale University) to clarify current usage rights and any applicable licensing fees.

Reference’s

• Goodman, W. K., Price, L. H., Rasmussen, S. A., Mazure, C., Fleischmann, R. L., Hill, C. L., … & Charney, D. S. (1989). The Yale-Brown Obsessive Compulsive Scale: I. Development, use, and reliability. Archives of general psychiatry, 46(11), 1006-1011.
• Goodman, W. K., Price, L. H., Rasmussen, S. A., Mazure, C., Delgado, P., Heninger, G. R., & Charney, D. S. (1989). The Yale-Brown Obsessive Compulsive Scale: II. Validity. Archives of general psychiatry, 46(11), 1012-1016.

Items of the Y-BOCS Symptom Checklist (Y-BOCS-SC)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

	Past	Current
— Contamination Obsessions — Concerns or disgust with bodily waste or secretions	1	2
Concerned with dirt or germs	1	2
Excessive concern with environmental contaminants	1	2
Excessive concern with household items (cleaners)	1	2
Bothered by sticky substances or residues	1	2
Concerned will get ill (eg, AIDS)	1	2
Concerned will get others ill by spreading germs	1	2

	Past	Current
Somatic obsessions	1	2
Other contamination obsessions
— Aggressive Obsessions — Violent or horrific images	1	2
Fear with act on unwanted impulses (eg, to stab friend)	1	2
Fear will harm others because not careful enough (eg, hit and run motor vehicle accident, putting poison in food)	1	2
Fear will be responsible for something else terrible happening (eg, fire, burglary)	1	2
Other Aggressive Obsessions
— Sexual Obsessions — Personally unacceptable sexual thoughts	1	2
— Religious Obsessions (Scrupulosity) — Concerned with sacrilege and blasphemy	1	2
Excess concern with right and wrong, morality	1	2

	Past	Current
— Hoarding/Saving Obsessions — Collects useless items, eg, old newspapers (distinguish from hobbies; concern with objects of monetary or sentimental value)	1	2
Concerned with losing or throwing out items by mistake	1	2
Other hoarding/saving obsessions
— Pathological Doubt — After completing routine activities, doubts whether performed or not (eg, whether signed check to pay bill)	1	2
Other pathological doubts
— Obsession With Need for Symmetry or Exactness — Bothered by things not being lined up or being in order	1	2
Other symmetry/exactness obsessions
— Other Obsessions — Superstitious fear (eg, luck or unlucky numbers or colors)	1	2
Any other obsessions
— Cleaning/Washing Compulsions — Excessive or ritualized hand washing	1	2

	Past	Current
Excessive or ritualized showering, bathing, tooth brushing, grooming	1	2
Cleaning of household items or other inanimate objects	1	2
Other measurers to prevent or remove contact with contaminants	1	2
Other cleaning/washing compulsions
— Checking Compulsions — Checking that did not harm others	1	2
Checking locks, stove, appliances, water faucets, emergency brake	1	2
Checking that did not make mistake (eg, balancing checkbooks over and over)	1	2
Checking tied to somatic obsessions (eg, checking self for signs of cancer)	1	2
Other checking compulsions
— Repeating Rituals — Repeating or rewriting	1	2

	Past	Current
Repeats same questions	1	2
Need to repeat routine activities (eg(eg, in and out door)	1	2
Other repeating rituals
— Hoarding/Collecting Compulsions — Inspecting household trash and accumulating useless objects	1	2
— Ordering/Arranging Compulsions — Lines up clothes, canned goods, shoes in fixed order	1	2
Need for symmetry (eg, shoelaces must be at same tension, socks at same height)	1	2
Can’t complete activity until “just right”	1	2
— Other Compulsions — Mental rituals (eg, silently reciting prayers to neutralize a bad thought)	1	2
Counting compulsions (eg, count ceiling tiles)	1	2
Excessive list making	1	2

	Past	Current
Pathological slowness (pervades most routine activities)	1	2
Need to tell, ask, confess	1	2
Need to touch, tap, or rub	1	2
Superstitious behaviors (eg, stepping on sidewalk cracks, bedtime rituals)	1	2
Asking for reassurance over and over	1	2
Self-damaging behaviours	1	2
Rituals involving blinking or staring	1	2
Any other compulsions