What psychiatry calculators cover
Psychiatry deals with conditions where structured questioning is itself the examination. There is no blood test for hazardous drinking and no scan for opiate withdrawal; the clinician's instruments are validated questionnaires and rating scales that turn reported symptoms and observed signs into scores the whole team can act on. The calculators in this library cover the substance use corner of psychiatric practice: screening for alcohol problems, brief assessment of alcohol-related concern, and the two withdrawal scales that guide hour-by-hour management when dependent patients stop drinking or using opiates.
The AUDIT, which stands for Alcohol Use Disorders Identification Test, is a ten-question screening tool developed by the World Health Organization. It asks about how often and how much the person drinks, about behaviours such as failing to do what was expected because of drinking, about adverse reactions including injury and blackouts, and about concern expressed by others. Each question scores 0 to 4, giving a total from 0 to 40 that places the drinker in a risk zone linked to a recommended response, from simple alcohol education through brief advice to specialist referral.
The CAGE questionnaire is shorter and older: four questions about feeling the need to Cut down, being Annoyed by criticism of drinking, feeling Guilty about drinking, and needing an Eye-opener drink in the morning. Two or more positive answers are widely taken as suggesting the person's drinking deserves further assessment. It is quick enough for a busy clinic or ward round and memorable enough to be asked from memory.
The two withdrawal scales are management tools rather than screens. CIWA-Ar, the Clinical Institute Withdrawal Assessment for Alcohol revised, scores ten features of alcohol withdrawal: nausea and vomiting, tremor, paroxysmal sweats, anxiety, agitation, tactile disturbances, auditory disturbances, visual disturbances, headache and orientation. The total runs from 0 to 67 and is repeated regularly, often hourly, to titrate treatment. COWS, the Clinical Opiate Withdrawal Scale, scores eleven signs and symptoms of opiate withdrawal, including resting pulse, sweating, restlessness, pupil size, bone and joint aches, gastrointestinal upset, tremor, yawning, anxiety, gooseflesh and runny nose or tearing, giving a total that grades withdrawal from mild to severe and guides the timing and dosing of treatment.
When clinicians and students use these tools
AUDIT is used wherever alcohol comes up opportunistically: general practice health checks, emergency departments, antenatal clinics, liver clinics and pre-operative assessments. A GP doing a new-patient check can work through the ten questions in a few minutes and use the zone to decide whether brief advice in the consultation is enough or a referral is warranted. Because it is non-judgemental in tone, asking about consumption before consequences, it works well as a conversation opener.
CAGE fits the time-pressured encounter: a ward round, a liaison psychiatry review, or an emergency department assessment where a fuller questionnaire is impractical. Junior doctors learn it early because alcohol underlies so many presentations, from falls and gastrointestinal bleeds to withdrawal seizures, and a quick CAGE helps decide whether alcohol needs to be part of the working diagnosis.
CIWA-Ar is used on medical wards, in emergency departments and in detoxification units whenever a patient at risk of alcohol withdrawal is admitted. The classic scenario is a patient admitted for something else, perhaps a fracture or pneumonia, who turns out to be alcohol dependent; as the hours since the last drink accumulate, nurses score CIWA-Ar regularly and give benzodiazepines according to the score, which is the symptom-triggered approach that avoids both under-treatment and over-sedation. COWS is used in addiction services, emergency departments and increasingly in general hospitals as opiate prescribing and use bring more patients with dependence into contact with acute care. It times the start of treatments such as buprenorphine, which must wait until withdrawal is established to avoid precipitating worse symptoms.
How to interpret results and what the scores change in practice
For AUDIT, the commonly cited zones are 0 to 7, suggesting lower-risk drinking where alcohol education is enough; 8 to 15, suggesting hazardous use where brief advice is recommended; 16 to 19, suggesting harmful use where brief counselling and monitoring are warranted; and 20 or more, suggesting possible dependence where specialist assessment and referral are needed. What changes in practice is the response offered in the consultation: a score of 6 ends with information, a score of 14 ends with a structured brief intervention, and a score of 24 ends with a referral discussion. The score does not diagnose; it routes.
For CAGE, the widely used threshold is two or more positive answers, which suggests the drinking pattern needs proper assessment. It is a prompt, not a verdict: a positive CAGE in a clinic leads to an AUDIT or a clinical interview, not to a label.
For CIWA-Ar, commonly used bands treat scores below 10 as minimal or mild withdrawal, 10 to 20 as moderate withdrawal requiring treatment and close monitoring, and above 20 as severe withdrawal with significant risk of seizures and delirium tremens. In symptom-triggered protocols, the score directly determines the benzodiazepine dose given at that assessment, and the trend determines the monitoring interval. A rising score despite treatment means the regimen is failing and senior help is needed; this is one of the few scales where the number drives prescribing in real time.
For COWS, commonly cited bands are 5 to 12 for mild withdrawal, 13 to 24 for moderate, 25 to 36 for moderately severe, and above 36 for severe withdrawal. The score guides supportive care and the timing of opiate replacement or buprenorphine induction. Because several COWS items are subjective, the score is most useful when the same assessor repeats it and when it is read alongside the patient's own report of how they feel.
Limitations and pitfalls
Screening tools inherit the limits of self-report. People understate their drinking for many reasons, including shame, fear of judgement, and simple poor recall, so a low AUDIT in someone with clinical signs of alcohol harm should prompt curiosity rather than reassurance. Cultural factors matter too: questions about guilt or about others' concern land differently across cultures, and the thresholds were validated in specific populations. A screening score is the start of a conversation, never the end of one.
CIWA-Ar has a well-known weakness: it relies partly on the patient's ability to report symptoms and cooperate with assessment, so it is unreliable in patients who are delirious, sedated, intubated or have significant cognitive impairment. Several of its items, such as agitation, anxiety and orientation, overlap with other causes of distress in hospitalised patients, from pain to sepsis to nicotine withdrawal, and attributing everything to alcohol withdrawal can delay the real diagnosis. It should not be the only lens through which a deteriorating patient is viewed.
COWS similarly mixes objective signs with subjective symptoms, and anxiety about withdrawal can inflate scores. Both withdrawal scales describe severity at a moment in time; they do not predict the trajectory on their own, and they do not replace clinical judgement about complications such as seizures, which need prophylaxis and monitoring beyond what any score provides. Finally, none of these tools is for self-assessment: withdrawal from alcohol can be life-threatening, and anyone with withdrawal symptoms needs medical care, not a home score.
How to use this library
Choose the tool that matches the clinical question: screening for alcohol problems points to AUDIT or CAGE, managing alcohol withdrawal points to CIWA-Ar, and assessing opiate withdrawal points to COWS. Work through every item rather than estimating, score from direct observation and questioning, and record the total with the date and time. For the withdrawal scales, repeat the score at the interval the local protocol specifies and let the trend guide treatment. Remember throughout that these instruments support clinical assessment but never replace it, and that a high score is a reason to assess and act, not to label.
Related specialities
Frequently asked questions
What is the AUDIT test?
AUDIT stands for Alcohol Use Disorders Identification Test: a ten-question screening tool developed by the World Health Organization to identify hazardous drinking, harmful drinking and possible alcohol dependence. It asks about consumption, drinking behaviour, adverse reactions and alcohol-related problems, scoring 0 to 40. Commonly cited zones are 0 to 7 for lower-risk drinking with alcohol education, 8 to 15 for hazardous use warranting brief advice, 16 to 19 for harmful use warranting brief counselling and monitoring, and 20 or more suggesting possible dependence needing specialist referral.
What does a high CIWA-Ar score mean?
CIWA-Ar, the Clinical Institute Withdrawal Assessment for Alcohol revised, scores ten features of alcohol withdrawal including nausea, tremor, sweats, anxiety, agitation, headache, auditory and visual disturbances, and orientation, from 0 to 67. Commonly used bands treat scores below 10 as minimal withdrawal, 10 to 20 as moderate withdrawal needing close monitoring and usually medication, and above 20 as severe withdrawal at risk of seizures and delirium tremens. Rising scores mean treatment needs to be intensified urgently.
Can these questionnaires diagnose addiction?
No. Screening tools like AUDIT and CAGE identify people who need a fuller assessment; they do not diagnose alcohol or drug use disorders on their own. Diagnosis requires a clinical interview against recognised criteria, considering the pattern of use, loss of control, and impact on health and life. A high screening score means have the conversation and assess properly, not label the person.
Who should use withdrawal scales like CIWA-Ar and COWS?
They are clinical tools for doctors, nurses and other trained staff managing withdrawal in hospitals, detoxification units, emergency departments and addiction services. Scoring requires bedside assessment skills and the results drive medication decisions, so they should not be used for self-assessment. Anyone experiencing withdrawal symptoms should seek medical care promptly, because alcohol withdrawal in particular can become life-threatening.
What should someone do if they are worried about their own or someone else's drinking or drug use?
Speak to a GP, pharmacist, or local drug and alcohol service, all of which can assess the situation confidentially and arrange support. These calculators can help someone understand what a screening score means, but they are not a substitute for professional assessment. If someone has withdrawal symptoms such as shaking, sweating, confusion, seizures or severe agitation, seek urgent medical help rather than trying to manage it alone.