DUDIT: Drug Use Disorders Identification Test

What this assessment is

The Drug Use Disorders Identification Test, or DUDIT, is an 11-item screen for drug use and drug-related problems during the past 12 months.

Anne Berman, Hans Bergman, Tom Palmstierna, and Frans Schlyter developed it as a drug-focused counterpart to the Alcohol Use Disorders Identification Test.

The original evaluation study tested the DUDIT in Swedish clinical, justice, and general-population samples.

The DUDIT is a screen. It does not diagnose a drug use disorder.

That is its limit.

Who it was designed for

The DUDIT was developed for adults. Its early evaluation included people in addiction treatment and criminal justice settings, along with a general-population sample.

Those groups differ from many people screened in primary care, mental health care, schools, or workplaces. Cutoffs from the original study should not be treated as universal boundaries.

Context matters.

Use with adolescents, older adults, translated forms, or a different cultural setting needs evidence for that population and version.

How it is administered

The standard DUDIT covers the past year. It can be self-completed or administered as an interview.

The form asks about patterns of drug use and problems connected with that use. Keep the 11-item structure, response choices, and timeframe unchanged when using published scoring guidance.

Complete responses are preferable. The developer manual does not establish one replacement rule for every missing-data situation. Do not silently score a missing response as zero.

Do not guess.

What it measures

The DUDIT covers frequency and patterns of drug use, difficulty controlling use, strong desire to use, and harmful consequences.

It focuses on drugs rather than alcohol. The DAST-10 also screens past-year drug-related problems, but it uses 10 yes-or-no responses and a different interpretation system.

The DUDIT total combines several types of information. Two people with the same total can have different use patterns and different clinical needs.

How scoring works

The first nine responses score from 0 to 4. The final two responses score 0, 2, or 4. Add all 11 values for a total from 0 to 44.

Higher totals indicate a greater likelihood of drug-related problems.

The number needs context.

Do not convert the total into a percentage or place it into invented mild, moderate, and severe bands. The original manual uses decision points rather than a complete set of severity ranges.

How to interpret a DUDIT score

The original manual gives preliminary guidelines of 6 or higher for men and 2 or higher for women as signals of possible drug-related problems.

It also reports that a score of 25 or higher suggested probable heavy dependence in the selected heavy-drug-use sample studied during development.

These figures came from early Swedish research and older diagnostic frameworks. They are not universal clinical cutoffs. Current services should choose a threshold that is supported for their population and purpose before reviewing results.

Set the rule first.

A result at or above a chosen decision point supports further assessment. It does not prove dependence, define current diagnostic severity, or prescribe treatment.

What the score cannot tell you

The DUDIT cannot establish a diagnosis, identify every substance involved, or determine whether intoxication or withdrawal requires urgent medical care.

It cannot explain why use occurs or show the full effect on health, relationships, work, housing, or safety.

A low result does not rule out harm. Serious risk can occur with a pattern that produces few scored responses, and self-report can be affected by recall, stigma, or concern about consequences.

Evidence and limitations

The original evaluation found that the DUDIT could distinguish many people with drug-related diagnoses from those without them in its study samples.

The study also showed why setting matters. Results differed across clinical, justice, and general-population groups, and the proposed decision points differed by sex.

Later use should not erase those limits. State the version, population, decision rule, and follow-up process whenever a DUDIT result is reported.