Symptom Checklist

SCL-90-R


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Overview

The Symptom Checklist-90 (SCL-90) is a comprehensive self-report instrument designed to assess a wide range of psychological symptoms and distress. Developed for use in clinical practice and research, the SCL-90 provides a detailed evaluation of an individual's symptomatology across multiple domains. It is useful for diagnosing mental health conditions, monitoring symptom changes, and evaluating treatment effectiveness.

Purpose

The SCL-90 aims to:

  • Assess the presence and severity of psychological symptoms
  • Provide a broad overview of mental health status
  • Aid in the diagnosis and monitoring of various psychological disorders
  • Evaluate the impact of therapeutic interventions on symptomatology

Structure

The SCL-90 consists of 90 items covering nine primary symptom dimensions and three global indices:

  • Primary Symptom Dimensions:
    • Somatization
    • Obsessive-Compulsive
    • Interpersonal Sensitivity
    • Depression
    • Anxiety
    • Hostility
    • Phobic Anxiety
    • Paranoid Ideation
    • Psychoticism
  • Global Indices:
    • Global Severity Index (GSI)
    • Positive Symptom Distress Index (PSDI)
    • Positive Symptom Total (PST)

Respondents rate the severity of symptoms over the past week on a 5-point scale:

Applications

  • Clinical Use: Clinicians use the SCL-90 to assess a wide range of symptoms, to monitor changes in symptom severity over time, and to guide treatment planning and evaluation.
  • Research Use: Researchers use the SCL-90 to study symptom profiles in various populations, to evaluate the effectiveness of psychological interventions, and to explore the relationships between different psychological constructs.

Psychometric Properties

The SCL-90 has demonstrated robust psychometric properties:

  • Internal Consistency: The SCL-90 exhibits high internal consistency, with Cronbach's alpha values typically above 0.70 for the primary dimensions, indicating reliable measurement of symptoms.
  • Test-Retest Reliability: The SCL-90 shows good test-retest reliability, reflecting stability in symptom reporting over time.
  • Validity: The SCL-90 has strong construct validity, effectively correlating with other measures of psychological distress and symptoms.

Translation and Adaptation

The SCL-90 has been translated into numerous languages and adapted for use in diverse cultural contexts, ensuring its applicability in a variety of settings.

Conclusion

The Symptom Checklist-90 (SCL-90) is a valuable tool for assessing psychological symptoms and distress across multiple domains. Its comprehensive coverage of symptoms, strong psychometric properties, and broad applicability make it an essential instrument for both clinical practice and research. By providing a detailed evaluation of symptomatology, the SCL-90 helps clinicians and researchers understand and address psychological issues effectively.

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Frequently asked questions

What is the SCL-90-R?

The Symptom Checklist-90-Revised (SCL-90-R) is a 90-item inventory assessing psychological symptoms across nine dimensions, including anxiety, depression, and somatization.

How long does the SCL-90-R take?

Most people need 15–20 minutes. Each item rates distress over the past week including today.

How is the SCL-90-R scored?

Each item is rated 0–4. The Global Severity Index (GSI) is the mean of all 90 items. Each of the nine dimensions is the mean of its items. PST counts items scored above 0; PSDI is the average intensity of those endorsed items. Your LuriaLab report shows GSI and each dimension with raw-mean screening bands: below 0.5 low, 0.5–0.99 mild, 1.0–1.49 moderate, 1.5–2.49 marked, 2.5 and above high. These are not Pearson / Derogatis gender-normed T-scores (where T ≥ 63 is often used for caseness).

What does the SCL-90-R Global Severity Index mean?

The GSI summarises overall psychological distress (mean of all items). Dimension scores highlight specific symptom areas. Your report breaks these down.

Is the SCL-90-R used for diagnosis?

It is primarily a screening and outcome measure. Clinical decisions should not rely on self-report inventories alone.

What is the SCL-90-R test?

The SCL-90-R (Symptom Checklist-90-Revised) is a 90-item inventory measuring psychological distress over the past week. It is one of the most widely used mental health screening tools in research and clinical settings — with nine subscales plus a Global Severity Index (GSI).

SCL-90 subscales

  • GSI — overall distress across all symptoms
  • Subscales — somatization, OCD, interpersonal sensitivity, depression, anxiety, hostility, phobic anxiety, paranoid ideation, psychoticism
  • Screening only — elevated scores suggest areas to discuss with a clinician; not a diagnosis

Related free screenings on LuriaLab

  • PHQ-9 — focused depression screening
  • DASS-21 — depression, anxiety, and stress subscales
  • ASRS v1.1 — ADHD screening when attention symptoms stand out
  • SCL-90 guide — how to take the test online free

Related glossary terms

Health Anxiety

  • Category

    General mental health

  • Adult assessment

  • References

    Derogatis, L.R., Lipman, R.S., & Covi, L. (1973). SCL-90: An outpatient psychiatric rating scale - Preliminary Report. Psychopharmacol. Bull. 9, 13–28.
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