Alcohol, Smoking and Substance Involvement Screening Test (ASSIST v3.1)

The ASSIST (Alcohol, Smoking and Substance Involvement Screening Test) is a World Health Organization screening questionnaire that identifies substance use and categorizes risk levels across nine substance classes, focusing on use in the past 3 months. Version 3.1 evaluates recent use, cravings, health/social/legal consequences, and prior attempts to control use.

The ASSIST provides a standardized Substance Involvement (SI) Score for each substance, allowing clinicians to differentiate low-, moderate-, and high-risk patterns. These SI scores support early detection, brief intervention planning, and referral pathways for specialized care when needed. While widely used in primary care, mental health, and substance-use settings, the ASSIST is a screening tool, not a diagnostic test.

  • At initial assessment or intake, especially in primary care or mental health settings
  • Every 6–12 months for ongoing monitoring
  • After major health or behavioural changes (e.g., relapse, medication shifts)
  • Any time substance use is suspected or clinically relevant

For professional reference, research, and education only. Not for diagnosis or medical advice.

The ASSIST (Alcohol, Smoking and Substance Involvement Screening Test) is a World Health Organization screening questionnaire that rates risk from substance use, giving a Substance Involvement Score for each substance class over the past 3 months [1].

Foundational Context

The ASSIST was created by the World Health Organization ASSIST Working Group to provide a globally standardized tool for identifying risky substance use across diverse settings and cultures. Earlier substance-use tools tended to focus on a single substance (e.g., AUDIT for alcohol), leaving clinicians without a comprehensive multi-substance approach. The ASSIST addresses this gap by screening nine major substance classes with validated scoring thresholds for each.

The tool was developed through an international field trial at nine sites [2] and further validated in a multi-site international study [1] and at individual sites such as Australia [3]. Version 3.1 refined the scoring guidance and brief intervention protocols.

What does the ASSIST measure?

The ASSIST examines substance involvement across commonly used substances, focusing on patterns that predict health, social, and dependency-related outcomes.

The assessment measures:

  • Recent use (past 3 months) across multiple drug categories
  • Lifetime exposure
  • Cravings and urges to use
  • Loss of control or failed efforts to cut down
  • Problems caused by use (health, social, legal)
  • Concern expressed by others
  • Injection drug use (risk flag, not part of scoring)

The output is a Substance Involvement (SI) Score for each drug class, providing a clear picture of risk level across substances.

How do you give the ASSIST?

  • Designed for use in primary care, community health, mental health, and addiction services
  • Can be administered via structured self-report or clinician interview
  • Takes approximately 5–10 minutes
  • Works best when delivered in a non-judgmental, supportive tone
  • May require clarification for some question concepts, especially in culturally diverse settings
  • Individuals with cognitive impairment or acute intoxication may require clinician-assisted administration

How do you score and interpret the ASSIST?

ASSIST scoring categorizes each substance into three risk levels:

Alcohol

  • 0–10: Low risk
  • 11–26: Moderate risk (brief intervention recommended)
  • 27+: High risk / possible dependence (assessment and specialty referral recommended)

All Other Substances

  • 0–3: Low risk
  • 4–26: Moderate risk
  • 27+: High risk / possible dependence

Interpretation Notes:

  • These thresholds come directly from World Health Organization v3.1 guidelines.
  • Scores reflect risk, not diagnosis.
  • High scores suggest problematic use patterns that may warrant more structured assessment (e.g., DSM-based evaluation, clinical interview).
  • Q8–Q10 do not contribute to SI Scores but offer clinically meaningful information about perceived problems, external concern, and prior failures to control use.
  • Injection use questions flag high-risk behaviour requiring immediate clinical attention.

Interpretation should always consider cultural context, co-occurring mental health symptoms, and the individual’s functional impact.

Psychometric properties

Reliability

  • Test–retest reliability in the good to excellent range across items, in a nine-country sample [2]
  • Feasibility. Participants did not find the questions difficult to answer [2]

Validity

  • Concurrent validity with the ASI-Lite, AUDIT, RTQ and the Severity of Dependence Scale [1]
  • Discriminative validity: scores separated substance use, abuse and dependence [1]
  • Construct validity: scores correlated with risk factors for drug and alcohol problems [1]

Key figures from the two main studies:

  • Development study (nine sites, n = 236). Average test–retest kappas ranged from 0.58 to 0.90 across items, and from 0.61 (sedatives) to 0.78 (opioids) across substance classes [2].
  • International validation study (n = 1,047). ASSIST scores correlated with the ASI-Lite (r = 0.76–0.88), AUDIT (r = 0.82) and RTQ (r = 0.78) [1].
  • Cutoffs. ROC-derived cutoffs showed sensitivities of 54–97% and specificities of 50–96% for most substances [1].

Limitations

  • Not a diagnostic tool for substance-use disorders
  • Self-report bias may influence responses
  • Cultural interpretation of substance use can affect item responses
  • Injection-use questions may require further risk-specific assessment
  • Does not assess withdrawal symptoms or medical complications

For individuals: This page is a clinical reference, not a diagnostic tool. If you have concerns about your own symptoms, bring this information to a qualified mental health professional.

Related

FAQ

  • How is the ASSIST scored?

    The ASSIST generates a Substance Involvement (SI) Score separately for each of the nine substance classes it screens. Items 2 through 7 contribute to the SI Score for each substance; items 8 through 10 provide additional clinical context but do not contribute to the score. Injection drug use is flagged independently and does not feed into SI Score totals.

  • What do the ASSIST risk levels mean?

    For alcohol, scores of 0–10 indicate low risk, 11–26 indicate moderate risk, and 27 or above indicate high risk with possible dependence. For all other substances, the thresholds are 0–3 (low), 4–26 (moderate), and 27+ (high). These cutoffs derive from the WHO v3.1 scoring guidelines and were established using receiver operating characteristic analysis in the international validation study.

  • Can the ASSIST diagnose a substance use disorder?

    No. The ASSIST is a screening tool designed to identify risk levels and guide triage, not to establish a diagnosis. A high SI Score indicates a pattern that warrants further clinical evaluation — such as a structured diagnostic interview using DSM or ICD criteria — but the score alone does not constitute a diagnosis of a substance use disorder.

  • Is the ASSIST self-report or clinician-administered?

    The ASSIST is designed for both formats. It can be completed by the individual as a structured self-report questionnaire or administered by a clinician in an interview format. Research has shown consistent performance across both delivery modes; clinician-assisted administration may be preferable for individuals with low literacy or cognitive difficulty.

References

    1. 1.Humeniuk R, Ali R, Babor TF, Farrell M, Formigoni ML, Jittiwutikarn J, de Lacerda RB, Ling W, Marsden J, Monteiro M, Nhiwatiwa S, Pal H, Poznyak V, Simon S. Validation of the Alcohol, Smoking And Substance Involvement Screening Test (ASSIST). Addiction. 2008;103(6):1039-47.
    2. 2.WHO ASSIST Working Group. The Alcohol, Smoking and Substance Involvement Screening Test (ASSIST): development, reliability and feasibility. Addiction. 2002;97(9):1183-94.
    3. 3.Newcombe DA, Humeniuk RE, Ali R. Validation of the World Health Organization Alcohol, Smoking and Substance Involvement Screening Test (ASSIST): report of results from the Australian site. Drug Alcohol Rev. 2005;24(3):217-26.

    © World Health Organization 2010. All rights reserved.

This library is an academic and clinical reference. A scale described here is not necessarily offered in HiBoop; each page says whether it is.

Add to your practice