Michigan Alcohol Screening Test (MAST): Questions, Scoring, and Limits

The Michigan Alcohol Screening Test (MAST) is a lifetime yes-or-no questionnaire that identifies alcohol-related problems across health, work, family, legal, and social domains. MAST produces a screening score; it does not diagnose alcohol use disorder or measure current intoxication.

The original MAST contains 25 questions. It asks about the person's history and consequences rather than limiting the reference period to the previous year.

MAST is therefore different from AUDIT, which emphasizes past-year consumption and harm, and from a breathalyzer, which measures alcohol in an exhaled sample at collection.

What Is the Michigan Alcohol Screening Test?

MAST is a structured alcohol-problem questionnaire developed by Melvin Selzer at the University of Michigan. The original instrument was designed to provide a consistent, quantifiable interview for identifying alcohol-related problems.

MAST questions emphasize the consequences and history of drinking. The instrument can be administered as an interview or self-report form when the wording and scoring key are kept consistent.

What Does the MAST Questionnaire Ask About?

MAST asks about lifetime alcohol-related consequences and attempts to change drinking. Its question domains include:

• how the person describes their drinking;
• memory loss or blackouts after drinking;
• concern or criticism from family and friends;
• difficulty stopping after one or two drinks;
• guilt, regret, or concern about drinking;
• work, relationship, legal, or driving consequences;
• health problems attributed to alcohol; and
• prior requests for help or alcohol treatment.

Different forms can adjust wording or item count. The form being used must be identified before the total score is interpreted.

What Are the MAST Versions?

MAST versions differ in length, wording, scoring, and intended use. The original MAST contains 25 questions; the Short MAST (SMAST) contains 13 questions; and the Brief MAST (BMAST) contains 10 questions.

A shorter version reduces administration time but also changes the information collected. A score from SMAST or BMAST should not be interpreted using the original MAST cutoff without checking the version.

How Does MAST Scoring Work?

MAST scoring assigns weighted values to alcohol-problem responses. The scoring key determines which yes or no answer receives a point, and the total reflects the number and weight of endorsed problems.

For the original MAST, a commonly cited interpretation treats 0 to 3 as no apparent alcohol problem, 4 as suggestive of a problem, and 5 or more as a reason for further evaluation. Those bands come from the original instrument and should not be transferred automatically to a shortened form.

Score ranges identify a screening signal. They do not assign mild, moderate, or severe DSM-5-TR alcohol use disorder.

What Does a High MAST Score Mean?

A high MAST score means the respondent endorsed more lifetime alcohol-problem indicators under that form's scoring key. The result supports a review of current drinking, impairment, withdrawal, medical risk, and treatment history.

A high lifetime score does not prove that current alcohol use meets diagnostic criteria. A person can have past alcohol-related problems without current disorder, and a person with current risky drinking can screen below a lifetime cutoff.

How Long Does the MAST Take?

The original MAST generally takes longer than a four-question screen because it contains 25 items about lifetime consequences. Administration time varies with reading speed, interview format, clarification, and the version selected.

How Is MAST Used in Clinical Assessment?

Clinicians use MAST results to decide whether a fuller alcohol assessment is warranted. Follow-up considers current symptoms, drinking pattern, withdrawal risk, medical history, mental health, other substances, and the person's goals.

MAST can add historical context to a current screen. The AUDIT questionnaire measures a different construct by asking about past-year consumption, dependence symptoms, and harm.

How Does MAST Differ From CAGE?

MAST is longer and lifetime-based, while CAGE uses four brief lifetime questions. MAST covers more consequence domains and uses weighted scoring; CAGE uses one point per yes response and focuses on four indicators.

The alcohol screening comparison shows why neither questionnaire should be treated as a universal alcohol test.

What Are the Limits of MAST?

MAST has limits because it is retrospective, consequence-focused, version-dependent, and self-report based. Memory, stigma, changing circumstances, and the respondent's understanding of the questions can affect the score.

Reliability varies across forms and populations. A MAST score does not measure current BAC, prove impairment, predict withdrawal severity by itself, or replace a diagnostic interview.

What Should You Do After Taking MAST?

After MAST, discuss an elevated result or ongoing concern with a qualified professional. Follow-up may include a current alcohol-use screen, diagnostic assessment, medical review, or treatment referral.

Confusion, seizures, hallucinations, or severe tremor after reducing alcohol require urgent medical evaluation. A MAST score should never be used to decide that withdrawal is safe to manage without medical support.