Single-Item Alcohol Screening Question: Scoring, Cutoffs & Interpretation

01 - What it measures

What this scale measures.

The single alcohol screening question (SASQ) asks one thing: 'How many times in the past year have you had X or more drinks in a day?', where X is five for men and four for women. Any answer above zero is a positive screen. It is designed to detect the whole span of unhealthy alcohol use - risky drinking that has not yet caused harm, as well as alcohol use disorder - in a single question that takes well under a minute.

The question targets heavy episodic drinking rather than average weekly consumption, because a pattern of heavy drinking days is what most reliably separates unhealthy from low-risk use. It carries no items on consequences, dependence or loss of control, so it tells you only whether a fuller assessment is warranted. It is a gate, not a measure: a positive answer should lead to a full AUDIT or a diagnostic conversation, not to a conclusion.

02 - Origin & purpose

Where it comes from.

The question comes from the National Institute on Alcohol Abuse and Alcoholism's clinician guidance on helping patients who drink too much, which recommended a single quantity-frequency question as the opening step in routine alcohol screening. The sex-specific thresholds - five drinks for men, four for women - reflect NIAAA's definitions of a heavy drinking day and the pharmacokinetic differences that make the same quantity produce higher blood alcohol concentrations in women.

Its primary-care validation came from Smith and colleagues in 2009, who tested the question against a rigorous reference standard in adult primary-care patients. McNeely and colleagues later showed in 2015 that the question performs acceptably when patients complete it themselves on a tablet rather than being asked by a clinician, which matters for any digital intake pathway. Because the wording originates in a US federal government publication, it is in the public domain and free to reproduce.

03 - Scoring & cutoffs

How scoring works.

There is no total to compute. The respondent gives a number of heavy drinking days in the past year, and any answer of one or more is a positive screen for unhealthy alcohol use. The threshold is sex-specific: five or more standard drinks in a day for men, four or more for women. The frequency of heavy drinking days carries information beyond the yes/no result - someone reporting monthly or weekly heavy drinking days warrants more urgent follow-up than someone reporting one occasion in a year - but the screening decision itself is binary. A positive screen should be followed by a full AUDIT or a clinical assessment; a negative screen in a patient you are otherwise concerned about should not close the question.

04 - Validation evidence

How well it performs.

Smith and colleagues (2009) validated the clinician-administered question in 286 adult primary-care patients against a reference standard combining a calendar-based drinking interview and a structured diagnostic assessment. The question detected unhealthy alcohol use with 81.8% sensitivity and 79.3% specificity, and current alcohol use disorder somewhat more sensitively but less specifically (87.9% and 66.8%). McNeely and colleagues (2015) tested self-administration on a touchscreen in primary-care patients and found sensitivity 73.3% and specificity 84.7% for unhealthy alcohol use, AUC 0.79 - a modest loss of sensitivity and a gain in specificity relative to being asked face to face. There are no internal-consistency or test-retest statistics to report: a single item has no internal structure, and the twelve-month recall window makes short-interval retest data uninformative.

05 - How it compares

How it compares to the alternatives.

06 - When to use it

Right tool, wrong tool.

Use the SASQ as a first-pass gate for unhealthy alcohol use in adults, with a fuller assessment reserved for those who screen positive.

07 - Confidence & precision

Reading the score with care.

A single binary screen has no standard error of measurement and no meaningful-change threshold, so precision is best expressed as predictive value. At the sensitivities and specificities reported by Smith and colleagues, roughly one in five people with unhealthy alcohol use will screen negative - which is why a negative answer should not override clinical concern. Conversely, in populations where unhealthy drinking is uncommon, most positive screens will not be confirmed on fuller assessment; that is expected behaviour for a gate whose job is to lose as few true cases as possible. The question is a screening trigger, not an outcome measure.

08 - Limitations

What it cannot tell you.

One item cannot distinguish risky drinking from alcohol use disorder; the AUDIT is needed to grade what a positive screen represents.

Sensitivity falls when the question is self-administered rather than asked directly (73.3% vs 81.8%), so roughly a quarter of true cases are missed on a form (McNeely et al., 2015).

A twelve-month recall of heavy drinking days is demanding, and under-reporting is likely where drinking is stigmatised or disclosure carries consequences.

The standard-drink definition is US-specific (14 g of pure alcohol); thresholds do not transfer directly to countries using different standard-drink units without adjustment.

Validated in adults in primary care; performance in adolescents, in pregnancy and in specialist psychiatric populations is not established from these studies.

Common questions from clinicians

FAQ

References

Source literature.

1. [1]Smith PC, Schmidt SM, Allensworth-Davies D, Saitz R Primary care validation of a single-question alcohol screening test (2009) ↩
2. [2]McNeely J, Cleland CM, Strauss SM, Palamar JJ, Rotrosen J, Saitz R Validation of self-administered single-item screening questions (SISQs) for unhealthy alcohol and drug use in primary care patients (2015) ↩
3. [3]Smith PC, Schmidt SM, Allensworth-Davies D, Saitz R A single-question screening test for drug use in primary care (2010) ↩
4. [4]National Institute on Alcohol Abuse and Alcoholism Helping Patients Who Drink Too Much: A Clinician's Guide (2005) ↩