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How to use the Panic Disorder Severity Scale (PDSS)

Learn how to administer, score, and interpret this seven-item tool that measures severity and tracks treatment progress.

July 31, 2026

By Ashley Abramson • Clinically reviewed by Caitlin Pugh, LCSW

10 min read

By Ashley Abramson • Clinically reviewed by Caitlin Pugh, LCSW

Affecting nearly 3% of American adults, panic disorder is a condition treated by many behavioral health providers. To diagnose panic disorder and create an effective treatment plan, many clinicians use evidence-based psychological assessments such as the Panic Disorder Severity Scale (PDSS), a clinician-administered assessment designed specifically to measure panic disorder severity.

Rather than simply counting a client’s panic attacks or symptoms, the PDSS measures the severity of symptoms and the overall degree of functional impairment, which makes it an especially useful tool for establishing a baseline, monitoring treatment progress over time, and supporting measurement-based care.

Below, learn more about how the PDDS works, how you can incorporate it into your clinical practice, and how Headway can support evidence-based panic disorder treatment.

Key insights

1

The Panic Disorder Severity Scale is a psychological assessment that measures the severity of panic disorder symptoms.

2

It’s structured as a seven-item questionnaire with a possible score range of 0-28 — the higher the score, the more severe the symptoms.

3

Headway helps clinicians incorporate measurement-based panic disorder care into clinical practice with a free, built-in EHR that includes documentation templates and billing support.

What is the Panic Disorder Severity Scale (PDSS)?

The Panic Disorder Severity Scale (PDSS) is a psychological assessment that measures the presence and severity of panic disorder symptoms, including panic attack frequency, panic-related distress, anticipatory anxiety, avoidance, and functional impairment over the last week. It’s commonly used by behavioral health clinicians for diagnosing panic disorder and monitoring symptoms over time — once they’ve ruled out other causes like PTSD or medication withdrawal. (Clinicians should have their clients see a medical provider to rule out heart-related or other medical conditions that could be causing the symptoms.)

Now considered the gold standard for measuring panic disorder symptoms, the PDSS was developed in the late 1990s by psychiatrist M. Katherine Shear. It measures symptoms and severity using seven different panic-related items. Each question has a 0-4 scale, and the total score indicates the severity of a person’s panic disorder symptoms. The PDSS is typically administered by clinicians, while the PDSS-SR is a self-report version clients can fill out on their own.

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What does the PDSS measure? Understanding the seven dimensions

The PDSS measures seven items related to panic disorder symptoms and functional impairment related to panic disorder:

Item 1 — Panic attack frequency: This question measures how many panic attacks someone had in the last week to help clinicians understand the frequency of symptoms.

Item 2 — Distress during attacks: This question measures how distressed, uncomfortable, or afraid a person was during panic episodes so clinicians can determine the severity of the attacks.

Item 3 — Anticipatory anxiety: This question measures how anxious a person feels about having a panic attack or fears related to the attack, which can help clinicians grasp how much a fear of panic attacks affects a client’s life.

Item 4 — Agoraphobic avoidance: This question measures whether and how much a person avoided certain places or situations to avoid panic attacks to help clinicians understand the degree to which panic disorder affects daily functioning.

Item 5 — Interoceptive fear and avoidance: This question measures whether and how much a person avoided or felt afraid during certain activities that elicit symptoms similar to panic attacks. This can provide more information about a person’s level of avoidance and functional impairment.

Item 6 — Work/home impairment: This question measures whether and how much a person’s panic disorder symptoms interfered with a person’s ability to complete responsibilities at work, school, or home. Like previous questions, it provides insight about functional impairment.

Item 7 — Social functioning impairment: This question measures whether and how much a person’s panic disorder symptoms interfered with their relationships and social life, offering more input about how panic attacks affect their daily life.

This multi-dimensional approach is more effective in diagnosis and symptom monitoring than attack-frequency measures alone.

How to score and interpret PDSS results

Each of the seven items on the PDSS is rated on a five-point scale, with 0 representing the absence of symptoms and 4 representing the highest severity during the last week. The total score is the sum of all seven questions, so the possible range is 0-28. In general, higher scores indicate more severe symptoms, while lower scores indicate less severity. The assessment also includes a composite score, which is the average of all the item scores (a range of 0-4).

Because agoraphobia can increase overall symptom severity and functional impairment, the PDSS uses slightly different interpretation thresholds for people with and without agoraphobia. Below, learn more about how to score and interpret PDSS results.

  • Severity interpretation without agoraphobia: Add the scores for all seven items to calculate a total score (0-28). For patients without agoraphobia, scores of 0-3 generally indicate normal symptoms, 4-5 borderline illness, 6-9 slight illness, 10-16 moderate illness, and 17 or higher marked illness.
  • Severity interpretation with agoraphobia: Total scores are interpreted using slightly different cutoffs for patients with agoraphobia. Scores of 0-5 generally indicate normal symptoms, 6-7 indicate borderline illness, 8-10 indicate slight illness, 11-15 indicate moderate illness, and 16 or higher indicate marked illness.
  • Remission threshold: A PDSS score of 5 or lower is generally considered remission for patients without agoraphobia, while a score of 7 or lower indicates remission for patients with agoraphobia.
  • Response threshold: A 40% or greater reduction in the total PDSS score from baseline is generally considered a clinically meaningful treatment response.
  • Validity rule: If more than one item is left unanswered, the PDSS should not be scored. If only one item is missing, clinicians may estimate the total score using standard scoring procedures or re-administer the missing item when possible.

When and how to use the PDSS in clinical practice

The PDSS is an effective yet simple and efficient tool for diagnosing panic disorder and monitoring symptoms over time, so you can adjust your treatment plan appropriately. Here’s what to know about when and how to use the PDSS in your therapy practice.

1. Administer the PDSS at baseline: Complete the PDSS during the initial evaluation or before starting treatment to establish a baseline measure of panic symptom severity. This score can provide a helpful reference point for monitoring changes over time.

2. Re-administer the PDSS regularly: Repeat the assessment at consistent intervals, such as every few weeks, at key treatment milestones, or whenever symptoms meaningfully change, to evaluate treatment response and determine whether the care plan should be adjusted.

3. Choose the appropriate format: The clinician-administered PDSS typically takes about 5-10 minutes to complete and allows providers to ask follow-up questions and use clinical judgment. The self-report version (PDSS-SR) can be completed independently before or during an appointment, making it a practical option for routine symptom monitoring.

4. Review the results: Share the score in a way that's easy for patients to understand, emphasizing that it represents a snapshot of current symptom severity rather than a label or diagnosis. Comparing current and previous scores can help patients recognize progress that may not be obvious day to day.

5. Use scores to guide care and document progress: Incorporate PDSS results into clinical documentation alongside the patient's history, reported symptoms, and clinical observations. Tracking scores over time can support treatment planning, demonstrate response to interventions, and encourage collaborative goal-setting with patients.

PDSS reliability and validity: What the research shows

The PDSS is an evidence-based tool that has been validated by many psychological studies. Research supports its reliability, validity, and ability to detect meaningful changes in panic disorder symptoms over time, which can help clinicians diagnose panic disorder and determine the most appropriate treatment plan for clients.

  • Internal consistency: Studies have found the PDSS to have good to excellent internal consistency, meaning its seven items consistently measure the same underlying construct of panic disorder severity.
  • Inter-rater reliability: The PDSS demonstrates excellent inter-rater reliability, which indicates that different trained clinicians tend to assign very similar scores when assessing the same patient.
  • Test-retest reliability: The PDSS also has good test-retest reliability, showing that scores remain stable over short periods when a patient's symptoms have not meaningfully changed.
  • Convergent and discriminant validity: Studies have found the PDSS correlates well with other established measures of panic disorder severity while showing lower correlations with measures of unrelated constructs. This supports both its convergent validity (it measures what it is intended to measure) and discriminant validity (it distinguishes panic disorder from other symptom domains).
  • Sensitivity to change: The PDSS is sensitive to clinical improvement, meaning scores reliably decrease as panic symptoms improve with treatment. This makes it well suited for measurement-based care and tracking treatment response over time.
  • International validation: The PDSS has been translated and validated in numerous languages — including Spanish, Portuguese, Italian, Hungarian, Finnish, Turkish, Chinese, French, Swedish, and Korean — with studies consistently supporting its reliability and validity across diverse populations and clinical settings.

PDSS vs. other panic disorder assessment tools

There are many different assessment tools clinicians can use to diagnose and monitor panic disorder, and each has a different potential use case. Learn more below about common panic disorder assessment tools so you can make an informed decision about the most effective measures for your clients.

  • PDSS vs. PAS: The PAS, or Panic and Agoraphobia Scale, measures panic symptoms as well as agoraphobia, anticipatory anxiety, disability, and health concerns in greater depth. The PDSS is often a better choice when clinicians need a brief, validated measure to assess panic disorder severity and monitor treatment progress. The PAS may be preferable when a more comprehensive evaluation of panic disorder and agoraphobia is needed.
  • PDSS vs. CGI scales: The Clinical Global Impression (CGI) scales provide a broad clinician rating of illness severity and improvement across any mental health condition. Unlike the PDSS, the CGI isn’t specific to panic disorder, making the PDSS a better option when clinicians want to quantify panic symptoms and track changes over time.
  • PDSS vs. panic diaries: Panic diaries ask clients to record panic attacks as they occur, including potential triggers, symptoms, and coping strategies. While diaries can provide detailed day-to-day information about panic episodes, the PDSS offers a standardized way to measure overall symptom severity and treatment response. Many clinicians use both tools together.
  • PDSS vs. GAD-7 or OASIS: The GAD-7 focuses on generalized anxiety symptoms, while the Overall Anxiety Severity and Impairment Scale (OASIS) measures anxiety severity and functional impairment across anxiety disorders. The PDSS is the better choice when panic disorder is the primary concern, while the GAD-7 or OASIS may be more appropriate for screening or monitoring broader anxiety symptoms.
  • PDSS-SR vs. PDSS: While the PDSS is administered by clinicians, the PDSS-SR is a self-report questionnaire clients can take on their own before a therapy session, which can save time and streamline routine symptom monitoring. The clinician-administered PDSS allows for follow-up questions and clinical judgment, making it especially useful for initial evaluations, diagnostic clarification, or more complex cases.

Using the PDSS to track treatment progress

Your client’s PDSS scores can also support ongoing monitoring, allowing you to better understand symptoms severity, panic attack frequency, and functional impairment over time — and to adjust your treatment plan appropriately as needed. Here’s an evidence-based look at how to use and track treatment progress.

  • Treatment response: A 40% or greater reduction in the total PDSS score from baseline is generally considered a clinically meaningful treatment response.
  • Much improved: A 40-74% reduction in the total PDSS score corresponds to being "much improved" on the Clinical Global Impression–Improvement (CGI-I) scale.
  • Minimally improved: A 10-39% reduction in the total PDSS score corresponds to being "minimally improved" on the CGI-I scale.
  • Remission: Remission is generally defined as a PDSS score of 5 or lower for clients without agoraphobia and 7 or lower for clients with agoraphobia.
  • Item-level tracking: Along with monitoring the total score, reviewing changes in individual items can help identify which aspects of panic disorder are improving or persisting over time. For example, a client's panic attack frequency may decrease while anticipatory anxiety or agoraphobic avoidance remains elevated. This can signal areas that may benefit from continued intervention or adjustments to the treatment plan.

How to access the PDSS

Before using the PDSS in clinical practice or research, it's important to understand how to access the assessment and whether permission is required for your intended use.

  • Copyright and permissions: The PDSS is copyrighted by its creator, M. Katherine Shear. Before reproducing, modifying, or integrating the instrument into a commercial product or electronic health record, clinicians and researchers should review the copyright holder's terms and work with their legal counsel to determine whether and how to obtain permission when required.
  • Clinical practice use: Individual clinicians can access the PDSS through published resources and assessment repositories for use in clinical practice, as long as they comply with any licensing or permission requirements.
  • DSM-5 alternative measure: Clinicians looking for a freely available, DSM-based option can use the DSM-5 Severity Measure for Panic Disorder—Adult. While it is not identical to the PDSS, it assesses panic disorder symptom severity using a standardized self-report format.
  • Digital assessment platforms: Many behavioral health EHRs and digital measurement-based care platforms include licensed versions of the PDSS or PDSS-SR, so clinicians can administer, score, and track results electronically. Availability varies by platform, so confirm whether the assessment is included with your software.
  • Institutional access: Organizations such as hospitals, universities, and healthcare systems may already have institutional licenses or subscriptions that provide access to the PDSS through their EHR, research office, or library services. Check with your organization's behavioral health or compliance to find out if access is already available.

Learn about other assessments with Headway

How Headway supports evidence-based panic disorder treatment

Measurement-based care can help clinicians use their own clinical judgment to treat clients more effectively by making more informed treatment decisions, monitoring symptoms over time, and determining how well interventions are working. But incorporating these tools into practice often involves more administrative work.

Headway’s free, built-in EHR includes documentation templates that make it easier to record assessment results and remain compliant with payer expectations. Headway also streamlines insurance verification and billing, so you can spend less time on paperwork and more time delivering evidence-based care. Whether you’re using the PDSS or another assessment, Headway helps make measurement-based care a more seamless part of your practice.

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This content is for general informational and educational purposes only and does not constitute clinical, legal, financial, or professional advice. All decisions should be made at the discretion of the individual or organization, in consultation with qualified clinical, legal, or other appropriate professionals.

© 2026 Therapymatch, Inc. dba Headway. All rights reserved. No part of this publication may be reproduced without permission.

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