CIWA-Ar Scale: Alcohol Withdrawal Scoring and Severity

The CIWA-Ar (Clinical Institute Withdrawal Assessment for Alcohol, revised) is a 10-item clinician-rated scale that measures how severe alcohol withdrawal is at the moment of the rating ¹. It is used in medical and withdrawal management settings to guide symptom-triggered care. It supports, and does not replace, a medical assessment.

What does the CIWA-Ar measure?

The CIWA-Ar measures the current severity of the alcohol withdrawal syndrome. Sullivan and colleagues shortened an earlier, longer CIWA scale to ten items in 1989, aiming to keep its clinical usefulness, validity and reliability while making it quicker to use in routine care and in drug trials ¹.

The ten items cover:

• Physical signs: nausea and vomiting, tremor, and paroxysmal sweats.
• Distress: anxiety and agitation.
• Perceptual disturbances: tactile, auditory and visual disturbances.
• Other symptoms: headache or fullness in the head, and orientation and clouding of the sensorium.

It is not a screen for alcohol use. To screen for hazardous drinking, use the AUDIT; for alcohol and drugs together, the CAGE-AID or ASSIST. For opioid withdrawal, the companion scale is the COWS.

How do you give the CIWA-Ar?

A clinician, often a nurse, rates each item from a short interview and direct observation. Several items, such as anxiety, headache and perceptual disturbances, depend on what the client reports, so the client must be able to communicate.

• Repeat ratings. The scale is designed to be repeated, so a score tracks withdrawal as it rises and settles. Rating frequency is set by the treating team's protocol.
• Symptom-triggered care. Practice guidelines recommend individualizing withdrawal treatment with withdrawal scales; in the trials pooled in the 1997 ASAM meta-analysis, this approach led to significantly less medication and shorter treatment ³.
• Setting. Ratings guide care in emergency departments, hospital wards and withdrawal management services, alongside vital signs, history and a physical examination ².

For clinical use and educational reference only. A CIWA-Ar score does not replace a medical assessment, and treatment decisions belong to the treating clinician and the setting's protocol.

How do you score and interpret the CIWA-Ar?

Nine items are rated from 0 to 7 and orientation from 0 to 4. The total is the sum, from 0 to 67. The form notes that clients scoring under 10 do not usually need additional medication for withdrawal ¹.

The score interpreter above uses the example ranges in the 2020 ASAM alcohol withdrawal guideline ²:

ASAM adds two cautions. First, the literature and practice vary on which scores best separate mild, moderate and severe withdrawal, so classifying severity is left to the clinician and may depend on the population and setting. Second, complicated withdrawal shares the 19-or-more range but is set apart by seizures or signs of delirium rather than by the number ².

Psychometric properties

• Development ¹: The 1989 revision reduced the scale to ten items while, according to its authors, keeping the validity and reliability of the longer version. It was developed in voluntary detoxification centres ⁴.
• Hospital inpatients ⁴: In a chart review of 479 cases on internal medicine and trauma or orthopaedic services, overall Cronbach's alpha was 0.74 and 0.82. Factor structures differed between the two services, and the authors concluded that their analyses did not support the reliability or validity of the CIWA-Ar in acutely ill or injured inpatients.
• One detoxification facility ⁵: In 207 people assessed at a single acute detoxification facility, Native American clients had consistently lower CIWA-Ar scores than white and Hispanic clients over the first six hours. The authors suggested the scale may underestimate withdrawal severity in some groups and called for prospective studies.

Limitations

• Not a diagnosis or a risk tool. The CIWA-Ar rates current symptoms. ASAM notes that withdrawal scales are not designed to assess the risk of developing severe withdrawal and cannot indicate risk before symptoms appear; it recommends a validated risk assessment as well ².
• Confounding. Scores can be falsely raised by other conditions, such as fever from infection or withdrawal from another substance, and falsely lowered by medicines such as beta-blockers ².
• Needs a client who can respond. Because several items rely on self-report, the scale is unsuitable for people who cannot communicate, are delirious or are critically ill; ASAM suggests a scale based more on objective signs in those cases ².
• Cutoffs vary. Severity ranges differ between guidelines and services, so a number means little without the protocol behind it ².
• Limited evidence in medical inpatients. It was developed in withdrawal treatment settings, and one hospital analysis did not support its reliability or validity in acutely ill or injured inpatients ⁴.

CIWA-Ar vs COWS

Both are clinician-rated withdrawal severity scales repeated over time. The CIWA-Ar rates alcohol withdrawal, and its ICD-10-CM context is codes such as F10.239, alcohol dependence with withdrawal. The COWS rates opioid withdrawal with eleven mostly observable signs. Neither screens for a substance use disorder; for that, see the AUDIT, DAST-10, CAGE-AID, ASSIST or, for adolescents, the CRAFFT.