Nuller Depersonalization Scale Test

In about 3 minutes, it helps clarify how strongly someone feels detached from self or reality. A 16 item clinician interview supports objective scoring and helps guide treatment and track change.

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Questions: 163 minutes

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08:30

October 2, 2025

October 2, 2025
Material has been updated

October 2, 2025
Material has been published

22,728 views

2,512 completions

1,790 likes

Verified by Daniel Hall

Psychologist with 25 years of experience

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How the Scales are Structured

example score

15/16

Pervasiveness (P)

Measures how many interview items show depersonalization/derealization-related disturbances, reflecting how widespread the experiences are across domains.

Limited

Moderate

Subtotal/Total

0 – 5: Limited | 6 – 12: Moderate | 13 – 16: Subtotal/Total

A score of 15 falls in the Subtotal/Total range, indicating disturbances were noted on nearly all items and the experiences are widespread.

example score

19/37

Depersonalization Severity (DS)

Measures the overall severity of depersonalization and derealization experiences based on the total interview-derived score.

Low

Moderate

High

0 – 12: Low | 13 – 24: Moderate | 25 – 37: High

A score of 19 falls in the Moderate range, suggesting a noticeable but not maximal burden of depersonalization-related experiences during the interview.

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DATA-BASED USER COHORTS

Who Usually Takes This Test?

Patients with dissociative symptoms

46%OF USERS

People describing feeling unreal, detached from their body, or as if the world is dreamlike are assessed to gauge symptom severity.

Complex anxiety or trauma cases

34%OF USERS

Individuals with panic, chronic anxiety, PTSD, or high stress who report numbness or disconnection are evaluated to clarify what’s driving their distress.

Mood or psychotic spectrum evaluation

20%OF USERS

Patients being assessed for depression, bipolar disorder, or psychotic symptoms may be interviewed to distinguish depersonalization from related experiences.

BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.

RESULTS YOU CAN ACTUALLY USE

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Statistical
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Get insights on behavioral and thought patterns you might not notice on your own. By uncovering subtle connections between your responses, you’ll better understand what may be driving your current results.

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Clarify, reflect, and explore your results right away. Talk through your experience, ask questions, and explore meanings in a calm, non-diagnostic dialogue.

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Used in 52+ countries

Benchmarking

See How You Compare

Once you complete the test, your results are compared with real-world data from people in your country.
Below is a preview of how scores are typically distributed across each scale.

Massiveness (M)

Average

9.2

Normal range

6.8 — 11.6

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

The Burden of Depersonalization (TBoD)

Average

27.1

Normal range

21.7 — 32.6

min.

max.

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

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CLEAR ANSWERS TO COMMON QUESTIONS

Frequently Asked Questions

What does this scale measure?

It measures the severity of depersonalization and derealization symptoms. It focuses on experiences of detachment from self, body, emotions, or the surrounding world.

How is the assessment administered?

It is administered as a brief clinician-led interview. Responses are based on follow-up questions to clarify the presence and intensity of symptoms.

How long does it take and how many items are included?

Administration typically takes about 3 minutes. It includes 16 questions.

Who is this assessment intended for?

It is intended for use in clinical settings when depersonalization or derealization is suspected. It may be used across a range of mental health conditions.

How are the results used?

Results provide a structured estimate of symptom severity at the time of assessment. They can support clinical formulation and tracking changes over time.

WHAT THE TEST MEASURES

About This Assessment

Nuller Depersonalization Scale Test - Symptoms and Signs

depersonalization psychopathology

Symptoms of detachment from self or surroundings can be clinically relevant across a range of psychiatric presentations. The Nuller Depersonalization Scale is used to screen and characterize the severity of depersonalization and derealization experiences in a time-efficient manner. It contains 16 items and typically requires about 3 minutes to complete.

Administration is generally clinician-directed (e.g., interview-based) to support clarification of subjective experiences and consistent rating. The Nuller Depersonalization Scale may be used to document baseline symptom burden, support differential clinical formulation, and monitor change over time; it should be interpreted in the context of the broader diagnostic assessment. Authors: D. Simeon; J. R. T. Davidson.

Author: D. Simeon, J. R. T. Davidson

Literature: Simeon, D., & Abugel, J. Feeling unreal: Depersonalization disorder and the loss of the self. Oxford University Press. 2006.

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