Clinician-Administered PTSD Scale (CAPS-5)

Abstract

The Clinician-Administered PTSD Scale (CAPS-5) is universally regarded as the definitive “gold standard” structured diagnostic interview for establishing a diagnosis of Posttraumatic Stress Disorder (PTSD). This comprehensive instrument consists of 30 items, meticulously aligned with the diagnostic criteria outlined in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5).

The CAPS-5 is designed for administration by trained clinicians and utilizes the Life Events Checklist (LEC) in conjunction with the interview to ensure thorough assessment of PTSD Criterion A (the exposure to trauma). The full interview process requires significant clinical engagement and typically takes between 45 and 60 minutes to complete, yielding both a continuous severity score and a categorical diagnosis.

Keywords

PTSD, CAPS-5, Structured Interview, DSM-5, Trauma Assessment, Gold Standard, Clinician-Administered PTSD Scale, Psychometric Assessment, Criterion A.

Authors

F.W. Weathers, D.D. Blake, P.P. Schnurr, D.G. Kaloupek, B.P. Marx, and T.M. Keane (for the CAPS-5 iteration).

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Purpose

The primary purpose of the CAPS-5 is to establish a definitive, reliable, and valid diagnosis of PTSD, strictly adhering to the standards set forth in the DSM-5. It moves beyond simple self-report measures by requiring administration by trained clinicians, which allows for detailed probing and clinical judgment in scoring the frequency and severity of reported symptoms.

Due to its high psychometric rigor, the CAPS-5 serves as the required benchmark instrument for clinical trials, major epidemiological studies, and complex differential diagnosis in specialized clinical settings. Its use ensures consistency and standardization across research and clinical practice regarding the presence and severity of posttraumatic symptomatology.

Construct

The CAPS-5 measures the presence and severity of the 20 core symptoms of PTSD as defined by the DSM-5. The instrument is fundamentally structured to assess the five diagnostic clusters: Criterion B (Intrusion), Criterion C (Avoidance), Criterion D (Negative Alterations in Cognitions and Mood), and Criterion E (Alterations in Arousal and Reactivity).

Each of the 20 core symptoms is rated independently on two separate dimensions using a 0–4 scale: frequency and intensity/severity. This critical dual-rating system provides a nuanced, detailed understanding of the patient’s presentation, allowing clinicians to generate both a continuous severity score (a total symptom burden) and a categorical diagnostic status (meeting full criteria for PTSD or not).

Validity

The CAPS-5 demonstrates robust evidence of validity, maintaining the strong psychometric reputation established by its predecessor, the CAPS-IV. Initial validation studies confirming the transition to the DSM-5 criteria showed strong alignment between the new and old versions.

Specifically, the CAPS-5 demonstrated high internal consistency and, critically, strong convergent validity with the widely-validated CAPS-IV, evidenced by a high correlation coefficient of r = .83. This correlation confirms that the CAPS-5 accurately measures the same underlying construct of PTSD severity while successfully incorporating the updated diagnostic architecture of the DSM-5.

Reliability

The CAPS instrument has consistently proven its reliability as a diagnostic tool across numerous studies and clinical applications. Its highly structured interview format is essential for minimizing inter-rater variability, provided the instrument is administered by personnel who have received specialized training in its use and scoring procedures.

The scale’s proven stability and consistency are further supported by its widespread international adoption and successful translation. The CAPS-5 has been successfully adapted for use in more than 10 languages globally, with specific validation studies having been conducted in various international populations, including those speaking Bosnian and Swedish, confirming its cross-cultural reliability.

Factor Analysis

The CAPS-5 is inherently designed to reflect the four-cluster symptom configuration introduced in the DSM-5 (Criteria B, C, D, and E). The clinical application and scoring primarily adhere to this standard four-factor structure for establishing a clinical diagnosis.

However, the detailed, symptom-specific ratings collected by the CAPS-5 provide the necessary granularity to test more complex theoretical factor models of PTSD psychopathology. Research utilizing factor analysis on CAPS-5 data frequently investigates alternative models, such as the six- or seven-factor solutions that propose finer distinctions within the symptom clusters, particularly separating dysphoria and anhedonia from other negative cognitions.

Instrument

Test Type: Structured Clinical Interview

Format: Clinician-administered, 30 items (20 core symptom items plus introductory and contextual items)

Language Available: English (Original), translated into over 10 languages including Bosnian and Swedish.

Population Group: Clinical and Research populations suspected of having PTSD.

Age Group: Adolescents and Adults (typically ages 17 and older).

Population Details: Widely used across veteran, military, and civilian trauma-exposed populations, serving both research and clinical needs.

Test Methodology: Interviewer rates each symptom based on both frequency (0–4 scale) and intensity/severity (0–4 scale) over the past month, requiring clinical judgment based on patient self-report and interviewer observation. Total administration time is approximately 45–60 minutes.

Keywords

Structured interview, CAPS-5, DSM-5 alignment, diagnosis, trauma, Criterion A, severity assessment, psychometric properties, clinical assessment.

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Authors

Author ORCID Identifier: Not publicly available for the scale development team.

Affiliation Email addresses: Contact information is managed centrally through the National Center for PTSD.

Correspondence Address: National Center for PTSD, US Department of Veterans Affairs (VA).

Permissions & Fee and Test Year

The CAPS-5 is the intellectual property of the National Center for PTSD, a division of the US Department of Veterans Affairs (VA). The scale is provided at no cost to qualified health professionals and researchers globally.

However, users must formally submit a request for use and agree to licensing terms via the VA’s online system to ensure appropriate use and tracking. The initial release of the DSM-5 aligned version (CAPS-5) occurred in 2015. The online instrument request form can be accessed here: https://www.ptsd.va.gov/professional/assessment/ncptsd-instrument-request-form.asp.

Reference’s

• Department of Veterans Affairs, United States of America. (2017). National Center for PTSD. http://www.ptsd.va.gov/ (accessed 1 September 2017).
• Weathers, F.W., Keane, T.M., & Davidson, J.R.T. (2001). Clinician Administered PTSD Scale: The first 10 years of research. Depression and Anxiety, 13(3), 132-156.
• Weathers, F.W., Blake, D.D., Schnurr, P.P., Kaloupek, D.G., Marx, B.P., & Keane, T.M. (2015). The Clinician-Administered PTSD Scale for DSM-5 (CAPS-5) – Past Month. Available from https://www.ptsd.va.gov/professional/assessment/documents/ptsd_trauma_assessments.asp. (Note: This link provides access to instrument documentation.)

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Items of the Clinician-Administered PTSD Scale (CAPS-5)

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

The source content provided for this entry describes the CAPS-5 as a 30-item structured interview corresponding to the DSM-5 diagnostic criteria for PTSD, but the specific text of the 30 individual items was not included in the original source material. Therefore, the items cannot be reproduced here.