Hong Life CalculatorsUnderstanding the AUDIT-C alcohol screening calculator — concept and principle
AUDIT-C is a three-question screen for hazardous drinking. It consists of the first three questions of the World Health Organization's 10-item Alcohol Use Disorders Identification Test (AUDIT), which cover how often you drink, how much you drink on a typical day and how often you drink heavily. Because it takes under a minute, it is widely used in primary care and self-assessment.
How it is calculated
Each question is scored 0 to 4 and the three scores are added, so the total runs from 0 to 12.
- Q1 frequency: never 0; monthly or less 1; 2–4 times a month 2; 2–3 times a week 3; 4 or more times a week 4.
- Q2 typical quantity (standard drinks): 1–2 = 0; 3–4 = 1; 5–6 = 2; 7–9 = 3; 10 or more = 4.
- Q3 six or more drinks on one occasion: never 0; less than monthly 1; monthly 2; weekly 3; daily or almost daily 4.
- Positive screen: 4 or more for men, 3 or more for women.
The principle
Alcohol harm depends both on the average amount and on drinking patterns. Frequency multiplied by typical quantity estimates weekly intake, and the heavy-episode question captures binge drinking, which carries its own risks of injury and acute harm. Validation studies compared AUDIT-C with structured interviews and found these short scores identify hazardous drinking almost as well as the full AUDIT. Women reach the same blood alcohol concentration with less alcohol on average, which is why their cut-off is one point lower.
Worked example
- Inputs: Q1 never (0), Q2 1–2 drinks (0), Q3 never (0), sex male.
- Total = 0 + 0 + 0 = 0.
- The male threshold is 4; 0 is below it, so the screen is negative.
How to read the result
A negative screen suggests low-risk drinking at present. A positive screen does not mean alcohol dependence; it means drinking is at a level where risks increase and a brief conversation with a health professional is worthwhile. Higher totals generally indicate greater risk, and if most of the score comes from Q1 alone (frequent but small amounts), the risk is usually lower than the same score driven by Q3.
Common mistakes
- Counting glasses or bottles instead of standard drinks; a large glass of wine or a bottle of soju is several standard drinks.
- Forgetting that the size of a "standard drink" differs between countries (for example about 10 g of pure alcohol in WHO materials and 14 g in the United States).
Frequently asked questions
What is the difference between AUDIT-C and the full AUDIT?
The full AUDIT adds seven questions about dependence and harm, and scores from 0 to 40.
Is any amount of alcohol safe?
Lower intake carries lower risk; many health bodies now say no level is entirely risk-free.
Should pregnant people use this cut-off?
No. Abstaining from alcohol is recommended during pregnancy.
Sources: Bush K et al., The AUDIT alcohol consumption questions (AUDIT-C), Archives of Internal Medicine 1998 · Babor TF et al., AUDIT: The Alcohol Use Disorders Identification Test, Guidelines for Use in Primary Care, 2nd ed., World Health Organization 2001