Michigan Alcoholism Screening Test (MAST)

Full MAST (25 items, 5–10 min) is preferred for comprehensive baseline assessment in addiction treatment or research. Brief MAST (13 items, 2–3 min) is suitable for rapid screening in primary care, emergency departments, or when time is limited. Brief MAST uses a simpler cutoff (≥5) and is nearly as sensitive/specific as full MAST. Use brief versions for screening; use full MAST for detailed assessment.

A MAST score of 5–6 (brief or full version) indicates probable alcohol use disorder and warrants follow-up clinical assessment: (1) structured diagnostic interview (SCID-5, MINI) to confirm AUD diagnosis, (2) assessment of drinking quantity and frequency (timeline followback), (3) evaluation of withdrawal risk (history of blackouts, tremors, seizures), and (4) referral to addiction medicine or addiction psychiatry if diagnosis confirmed. Brief intervention (5–15 min counseling) may be offered to at-risk drinkers; more severe cases need specialty treatment.

MAST is less ideal for longitudinal monitoring than AUDIT. MAST captures static consequences (past job loss, family conflict) that don't change rapidly even if drinking stops. AUDIT (focusing on recent consumption and frequency) is more sensitive to changes in drinking behavior over weeks to months. Use MAST at baseline; use AUDIT or more frequent drinking diaries during treatment to track progress.

Discrepancy between MAST score and patient's perception may indicate: (1) lack of insight (common in alcoholism), (2) minimization or denial, (3) recovery and behavior change (high past score, but currently abstinent or controlled). Ask follow-up questions: 'Are you currently drinking? How much per week?' and 'Has your drinking caused problems with family, work, or health?' Combine MAST with recent drinking history (past month/week) and objective measures (liver enzyme tests, biomarkers) for full picture.

MAST was originally developed to screen for 'alcoholism' (dependence) but is now understood to identify alcohol use disorder across severity levels (mild, moderate, severe per DSM-5). High MAST scores (≥20) are more specific to moderate-severe AUD; scores 5–10 may indicate mild AUD or at-risk drinking. Formal diagnosis requires DSM-5 assessment: how many of 11 criteria are present? MAST helps identify cases; diagnosis requires detailed clinical evaluation.

Original MAST was developed primarily in middle-aged men and may have different sensitivity/specificity in women or older adults. Some research suggests women may have higher false-positive rates (medical items may be positive for reasons other than alcohol). Older adults may have atypical presentations (falls, confusion, poor nutrition) attributed to aging rather than alcohol. Clinical judgment is advised: interpret MAST scores alongside clinical history, not as an absolute cutoff. Consider AUDIT or AUDIT-C for supplementary assessment.