Nursing care
Alcohol Screening: the method, the errors, and the exam
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Alcohol screening is a structured four-question interview, most often the CAGE tool, used to identify patients whose drinking carries clinical risk. Two or more positive answers is treated as a threshold for referral, not a cue to revisit the topic at a later visit. The screen works only when asked directly, privately, and without judgment in the wording.
What the skill is for
Alcohol screening exists to catch risky drinking before it produces a crisis: withdrawal on an unrelated admission, a missed interaction with a new prescription, or an injury that was really an accident of intoxication. Unlike a lab test, it depends entirely on the patient's honest self-report, which makes the interviewing skill the clinical skill.
The CAGE questionnaire is the tool taught most widely for this purpose: Cut down, Annoyed, Guilty, Eye-opener. Each letter maps to a question about the patient's relationship with alcohol rather than the volume consumed. That design matters because volume-based self-report is notoriously unreliable, while the CAGE questions probe consequences and patterns the patient is more likely to answer honestly, especially once rapport is established.
The method, step by step
Ask the four CAGE questions in a private setting, without a family member present, and in a neutral tone. Have you ever felt you should Cut down on your drinking? Have people Annoyed you by criticising your drinking? Have you ever felt Guilty about your drinking? Have you ever had a drink first thing in the morning to steady your nerves or get rid of a hangover, the Eye-opener question?
Score one point per yes answer. A score of two or more is the accepted threshold indicating a likely alcohol use problem requiring further assessment. The screen itself does not diagnose alcohol use disorder; it flags who needs a fuller assessment, typically using AUDIT or a clinical interview with a specialist. Document the exact answers, not just the total score, since the pattern of responses informs the referral conversation that follows.
Where it goes wrong
The most common failure is asking the questions in front of family, which suppresses honest answers, particularly to the Guilty and Eye-opener questions. A second failure is softening the wording to avoid discomfort, for instance substituting 'do you drink socially' for the actual CAGE items, which defeats the tool's validation.
The most consequential failure is treating a positive screen as a soft finding to revisit later. Two or more positive answers is a referral trigger, not a conversation to schedule for the next appointment. Deferring the referral leaves a patient with a flagged risk unassessed, and if that patient is later admitted for an unrelated procedure, undocumented risk of withdrawal goes unmanaged. A related error is screening once at intake and never rescreening; drinking patterns change, and a negative screen six months ago does not clear a patient today.
Practising it deliberately
Rehearse the four questions verbatim until they come out in a steady, unhurried tone, because hesitation on the Eye-opener question signals judgment to the patient before they have even answered. Practise the transition into the screen too: framing it as a routine question asked of every patient, not one triggered by suspicion, reduces defensiveness.
Role-play the referral conversation separately from the screening conversation, because it is a distinct skill. A nurse who is fluent at asking the four questions but freezes when a patient scores two positives has not finished learning the skill. Practise saying, directly, that the answers indicate a pattern worth a specialist assessment, and have the referral pathway in your own institution memorised before you need it.
Applying it on the exam
Exam stems testing alcohol screening usually present a patient's answers to some or all of the CAGE questions and ask for the next nursing action. If the stem gives two or more positive answers, the correct answer is initiating referral or further assessment, not continued observation, not deferring to the next visit, and not simply documenting for the physician to review at their convenience.
Watch for stems that describe classic Eye-opener behaviour, drinking on waking, without using the word alcohol at all; test-takers who don't recognise the pattern will miss the cue entirely. Also watch for distractor answers that treat a single positive answer as sufficient for referral. One positive answer warrants continued monitoring and patient education, but the referral threshold in CAGE is specifically two.
A worked example
A 46-year-old man admitted for a hernia repair answers yes to Cut down and yes to Eye-opener during pre-operative screening, no to the other two. That is two positive answers, meeting the referral threshold. The correct nursing action is to notify the provider and initiate an alcohol use assessment before surgery, both because his answers meet the threshold and because unmanaged alcohol dependence raises the risk of withdrawal in the post-operative period, when he will be unable to self-medicate the way he does at home.
Contrast this with a patient who answers yes only to Annoyed, describing a spouse who nags about weekend drinking. One positive answer does not meet the referral threshold; the appropriate response is education and a note to rescreen at the next visit, not an immediate specialist referral.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our health promotion practice questions are the closest set to what this page covers.
One question from the health promotion set
A client at 30 weeks' gestation reports a headache that will not resolve, blurred vision, and swelling of the hands. Blood pressure is 158/104 mm Hg. Which action should the nurse take first?
Rationale
Headache that will not resolve, visual changes, and a blood pressure of 158/104 after 20 weeks are severe features of preeclampsia — the client is at risk of seizing. Notify and prepare for magnesium sulfate, which is given for seizure prophylaxis rather than for the blood pressure itself. Resting and rechecking in an hour delays treatment, and a urine culture answers a different question entirely.
Answer: B
Common questions
What does each letter in CAGE stand for?
Cut down, Annoyed, Guilty, and Eye-opener. Each corresponds to one of the four screening questions, and each yes answer scores one point.
How many positive CAGE answers require referral?
Two or more positive answers is the accepted threshold indicating likely alcohol use problems and the need for further assessment. It is treated as an action point, not a finding to monitor at a future visit.
Should family members be present during alcohol screening?
No. Screen the patient privately without family present, since their presence measurably suppresses honest answers, particularly on the Guilty and Eye-opener questions.
Does a negative CAGE screen mean a patient never needs rescreening?
No. Drinking patterns change over time, so a negative screen at one visit does not exempt a patient from being screened again at future encounters, particularly after a major life change or new diagnosis.
Is CAGE the only alcohol screening tool nurses use?
It is the most widely taught four-question tool, but AUDIT is commonly used for a fuller assessment once CAGE flags risk. Institutional protocols vary on which tool is used at intake versus at referral, so check local policy.