4.1 Alcohol Use Screening & Brief Intervention

Epidemiology and Clinical Scope of Unhealthy Alcohol Use

Unhealthy alcohol use is one of the leading preventable causes of morbidity, mortality, and disability in the United States, contributing to more than 140,000 deaths annually and accounting for substantial healthcare expenditures. The spectrum of unhealthy alcohol use encompasses a continuum extending from risky or hazardous drinking (drinking patterns that elevate the risk of future physical or mental health consequences) to harmful drinking (patterns causing established medical or psychosocial injury) and formal Alcohol Use Disorder (AUD) as defined by the DSM-5-TR.

In outpatient primary care, the vast majority of patients with unhealthy drinking do not carry an established diagnosis of severe alcohol dependence; rather, they present with risky drinking that silently exacerbates chronic medical disorders—including essential hypertension, cardiac arrhythmias (notably atrial fibrillation), gastroesophageal reflux disease, nonalcoholic/metabolic fatty liver disease, insomnia, depression, and bone demineralization. Consequently, systematic primary care screening and early brief intervention represent some of the highest-value preventive clinical services in ambulatory medicine.

---

Screening Guidelines & Validated Screening Instruments

The U.S. Preventive Services Task Force (USPSTF) assigns a Grade B recommendation for screening all adults aged 18 and older—including pregnant individuals—for unhealthy alcohol use in primary care settings, coupled with providing persons engaged in risky or hazardous drinking with brief behavioral counseling interventions. The American Academy of Family Physicians (AAFP) fully endorses this recommendation.

Clinicians should not rely on unstructured clinical intuition or general questioning, which misses up to 50% to 75% of patients with unhealthy drinking. Instead, validated screening instruments must be integrated into routine intake workflows:

1. The Single-Question Screening Test

• Prompt: "How many times in the past year have you had 5 or more drinks in a day (for men) or 4 or more drinks in a day (for women)?"
• Interpretation: Any response of one or more times ($\ge 1$) constitutes a positive screen, yielding a sensitivity of 80% to 88% and a specificity of 74% to 88% for unhealthy alcohol use.
• Clinical Utility: Rapid, highly pragmatic, and effortlessly incorporated into nursing vital signs or electronic health record (EHR) pre-visit questionnaires.

2. The AUDIT-C (Alcohol Use Disorders Identification Test – Consumption)

The AUDIT-C comprises the first three consumption-specific questions of the full 10-item World Health Organization AUDIT questionnaire. Each question is scored from 0 to 4, yielding a total score from 0 to 12:

1. How often do you have a drink containing alcohol? (0 = Never; 1 = Monthly or less; 2 = 2–4 times/month; 3 = 2–3 times/week; 4 = 4+ times/week)
2. How many drinks containing alcohol do you have on a typical day when you are drinking? (0 = 1 or 2; 1 = 3 or 4; 2 = 5 or 6; 3 = 7 to 9; 4 = 10 or more)
3. How often do you have 6 or more drinks on one occasion? (0 = Never; 1 = Less than monthly; 2 = Monthly; 3 = Weekly; 4 = Daily or almost daily)

Diagnostic Cutoffs:

• Men: A score of $\ge 4$ points is considered positive for unhealthy alcohol use (sensitivity ~86%, specificity ~72%).
• Women: A score of $\ge 3$ points is considered positive (sensitivity ~88%, specificity ~80%).
• A higher score (e.g., $\ge 7–8$ points) strongly correlates with moderate-to-severe Alcohol Use Disorder.

3. The Full 10-Item AUDIT

The gold-standard comprehensive screening questionnaire evaluates alcohol consumption (Questions 1–3), drinking behaviors and dependence symptoms (Questions 4–6), and alcohol-related adverse consequences (Questions 7–10). Scored from 0 to 40:

• 0–7 points: Low risk (provide positive reinforcement and general health education).
• 8–15 points: Hazardous or harmful alcohol use (provide brief behavioral intervention and structured follow-up).
• 16–19 points: Harmful alcohol use / intermediate risk (provide brief intervention, discuss pharmacotherapy, and schedule close medical monitoring).
• 20–40 points: Severe risk / Alcohol Use Disorder (provide brief intervention, medical evaluation for detoxification/pharmacotherapy, and direct referral to specialized addiction treatment).

4. The CAGE Questionnaire

The historic CAGE questionnaire consists of 4 mnemonic questions:

• Have you ever felt you should Cut down on your drinking?
• Have people Annoyed you by criticizing your drinking?
• Have you ever felt bad or 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 (Eye-opener)?

Board Exam Pearl on CAGE: A score of $\ge 2$ positive responses has high specificity (~90%) for established, severe alcohol dependence. However, CAGE has poor sensitivity (<40–50%) for detecting early, at-risk, or hazardous drinking because it queries lifetime behavioral guilt rather than current volume or consumption patterns. Modern guidelines favor the AUDIT-C or Single-Question Screener for universal primary care screening.

Screening Instrument Comparison

---

Standard Drink Quantification & NIAAA Risky Drinking Limits

Accurate screening requires precise clinical quantification of ethanol intake. In the United States, one standard drink contains approximately 14 grams (0.6 fluid ounces or 1.2 tablespoons) of pure ethanol.

Standard Drink Equivalents

• Regular Beer: 12 fluid ounces (355 mL) at ~5% alcohol by volume (ABV).
• Craft Beer / Malt Liquor: 8 to 9 fluid ounces at ~7% ABV (a 16 oz craft IPA may equal 2 to 2.5 standard drinks).
• Table Wine: 5 fluid ounces (148 mL) at ~12% ABV (a standard 750 mL bottle contains ~5 standard drinks).
• Fortified Wine (sherry, port): 3 to 4 fluid ounces at ~17% ABV.
• Distilled Spirits (80-proof) (vodka, whiskey, gin, rum, tequila): 1.5 fluid ounces (44 mL, a single "shot") at 40% ABV.

NIAAA Definitions of Risky Drinking Patterns

The National Institute on Alcohol Abuse and Alcoholism (NIAAA) defines maximum drinking limits that minimize alcohol-attributable health harm in non-pregnant adults:

• Men Aged 18 to 64:
  • Daily limit: No more than 4 standard drinks on any single day, AND
  • Weekly limit: No more than 14 standard drinks per week.
• Women (All Ages) and Men Aged $\ge 65$:
  • Daily limit: No more than 3 standard drinks on any single day, AND
  • Weekly limit: No more than 7 standard drinks per week.
  • Physiological rationale for lower limits in women: Lower gastric alcohol dehydrogenase (ADH) activity, higher proportion of body fat, and lower total body water distribution volume result in significantly higher blood alcohol concentrations (BAC) per gram of ethanol consumed compared to men.
  • Physiological rationale in older adults: Age-related reduction in total body water, decreased hepatic microsomal clearance, enhanced central nervous system sensitivity, and higher prevalence of interacting medications (antihypertensives, sedatives, NSAIDs).
• Binge Drinking: A pattern of drinking that elevates blood alcohol concentration (BAC) to $\ge 0.08\text{ g/dL}$ ($\ge 17.4\text{ mmol/L}$). This typically corresponds to consuming $\ge 5$ standard drinks for men or $\ge 4$ standard drinks for women within approximately 2 hours.
• Heavy Alcohol Use: Binge drinking on 5 or more days in the past 30 days.

---

The SBIRT Protocol: Screening, Brief Intervention & Referral to Treatment

SBIRT is an evidence-based, comprehensive public health model designed for early identification and intervention in healthcare settings:

1. Screening (S): Universal, systematic screening of all patients using validated tools (e.g., AUDIT-C) to rapidly identify individuals engaging in unhealthy drinking.
2. Brief Intervention (BI): A short, structured dialogue (typically 5 to 15 minutes) utilizing motivational interviewing principles to raise the patient's awareness of their drinking risks and elicit internal motivation to modify behavior.
3. Referral to Treatment (RT): Facilitating proactive, warm-handoff referrals to specialty addiction medicine, outpatient behavioral therapy, medically supervised detoxification, or peer recovery groups for patients meeting criteria for moderate-to-severe Alcohol Use Disorder.

---

Motivational Interviewing (MI) Principles & Techniques

Motivational interviewing is a collaborative, goal-oriented communication method designed to strengthen personal motivation for and commitment to a specific behavioral goal by eliciting and exploring the person's own reasons for change within an atmosphere of acceptance and compassion.

The Spirit of MI: The PACE Model

• Partnership: Collaborative alliance between two equals; avoiding the "expert trap" or authoritarian lecturing.
• Acceptance: Unconditional positive regard, honoring patient autonomy, empathy, and affirmation.
• Compassion: Actively prioritizing the patient's well-being and best interests.
• Evocation: Drawing out the patient's own ideas, values, and motivations for change rather than imposing external advice.

Core Micro-Skills: The OARS Framework

• Open-Ended Questions: Questions that cannot be answered with a simple "yes" or "no," encouraging reflection ("What role does alcohol play in your routine when winding down after a stressful shift?").
• Affirmations: Explicitly recognizing the patient's strengths, honesty, and past successes ("It takes real honesty and courage to share your drinking patterns with me today.").
• Reflective Listening: Stating back the emotional or cognitive essence of what the patient expressed. Reflections can be simple, amplified, or double-sided to illuminate internal ambivalence ("On one hand, drinking helps numb the anxiety you feel in the evenings; on the other hand, you are worried about how it impacts your liver enzymes and your presence with your children.").
• Summaries: Synthesizing the discussion to consolidate key points, highlight change talk, and transition toward planning ("Let me make sure I've captured everything: you value your health and want to avoid liver disease, but alcohol has become your default coping tool for work stress. You'd like to explore alternative ways to relax that don't involve drinking. Is that accurate?").

The Readiness Ruler

When assessing readiness to change, clinicians utilize a 1-to-10 visual or verbal scale assessing Importance ("How important is it for you to cut down?") and Confidence ("How confident are you that you could succeed?"):

• Evoking Change Talk: If a patient chooses a 4 on a scale of 1 to 10, the critical MI response is: "Why did you choose a 4 and not a 1 or a 2?" This forces the patient to articulate their own internal reasons for wanting to change.
• Identifying Action Steps: Follow up with: "What would it take for you to move from a 4 to a 6 or a 7?" This prompts the patient to problem-solve practical solutions.

---

The FRAMES Brief Intervention Model

The FRAMES model provides a time-tested, structured framework for delivering brief clinical interventions in primary care encounters lasting under 10 minutes:

1. Feedback (F): Deliver objective, personalized feedback regarding the patient's reported consumption, calculated screening scores, and associated physical findings or laboratory abnormalities ("Based on the screening questionnaire, you are consuming 22 drinks per week, which places your health in the hazardous drinking category and explains the elevation in your liver enzymes.").
2. Responsibility (R): Emphasize that the decision to change, moderate, or stop drinking rests entirely with the patient ("No one can force you to change how you drink; what you decide to do with this information is completely up to you.").
3. Advice (A): Provide a clear, explicit, non-judgmental clinical recommendation to reduce or eliminate drinking ("As your physician, my strong medical recommendation is that you cut back your drinking to below the recommended limits of no more than 3 drinks on any day and no more than 7 per week, or consider stopping entirely.").
4. Menu of Options (M): Offer a diverse selection of practical strategies rather than a single prescriptive mandate (e.g., designating alcohol-free weekdays, alternating alcoholic drinks with sparkling water, using a smartphone tracking app, initiating pharmacotherapy, or attending a SMART Recovery or AA meeting).
5. Empathy (E): Maintain a warm, supportive, non-confrontational, and reflective conversational tone throughout the interaction.
6. Self-Efficacy (S): Foster optimism and reinforce the patient's confidence and capability to succeed ("You have successfully navigated significant workplace challenges in the past, and I am confident that with a clear plan, you can take control of your drinking.").

---

Diagnostic Criteria for Alcohol Use Disorder (DSM-5-TR)

Alcohol Use Disorder is diagnosed when a patient demonstrates a problematic pattern of alcohol use leading to clinically significant impairment or distress, manifested by at least 2 of the following 11 criteria occurring within a 12-month period:

Impaired Control

1. Alcohol is often taken in larger amounts or over a longer period than was intended.
2. Persistent desire or unsuccessful efforts to cut down or control alcohol use.
3. A great deal of time is spent in activities necessary to obtain alcohol, use alcohol, or recover from its effects.
4. Craving, or a strong desire or urge to use alcohol.

Social & Occupational Impairment

1. Recurrent alcohol use resulting in a failure to fulfill major role obligations at work, school, or home.
2. Continued alcohol use despite having persistent or recurrent social or interpersonal problems caused or exacerbated by the effects of alcohol.
3. Important social, occupational, or recreational activities are given up or reduced because of alcohol use.

Risky Use

1. Recurrent alcohol use in situations in which it is physically hazardous (e.g., driving an automobile, operating machinery).
2. Alcohol use is continued despite knowledge of having a persistent or recurrent physical or psychological problem that is likely to have been caused or exacerbated by alcohol.

Pharmacological Criteria

1. Tolerance, defined by either: (a) a need for markedly increased amounts of alcohol to achieve intoxication or desired effect; or (b) a markedly diminished effect with continued use of the same amount of alcohol.
2. Withdrawal, manifested by either: (a) the characteristic withdrawal syndrome for alcohol; or (b) alcohol (or a closely related substance, such as a benzodiazepine) is taken to relieve or avoid withdrawal symptoms.

Severity Staging

• Mild AUD: Presence of 2 to 3 criteria.
• Moderate AUD: Presence of 4 to 5 criteria.
• Severe AUD: Presence of 6 or more criteria.

---

Pharmacotherapy for Alcohol Use Disorder

Pharmacotherapy is substantially underutilized in primary care, with fewer than 10% of eligible AUD patients receiving evidence-based medications. The American Psychiatric Association (APA) and the Department of Veterans Affairs / Department of Defense (VA/DoD) guidelines recommend offering pharmacotherapy to all patients with moderate-to-severe AUD who desire to reduce consumption or achieve abstinence.

Master Table of Pharmacotherapies for Alcohol Use Disorder

---

Laboratory Markers of Chronic Alcohol Consumption

Laboratory biomarkers provide objective biological evidence to corroborate clinical history, assess end-organ hepatobiliary injury, monitor treatment adherence, and detect early relapse.

Master Table of Laboratory Biomarkers

---

Acute Alcohol Withdrawal Syndromes & Medical Safety

Family physicians must distinguish outpatient-treatable hazardous drinking from acute alcohol withdrawal requiring emergency hospitalization:

Clinical Spectrum of Alcohol Withdrawal

• Minor Withdrawal (6 to 12 hours post-cessation): Tremulousness (the "shakes"), insomnia, mild diaphoresis, palpitations, anxiety, headache, anorexia, mild tachycardia, and hypertension. Intact orientation.
• Alcoholic Hallucinosis (12 to 24 hours post-cessation): Visual, auditory, or tactile hallucinations with clear sensorium and intact orientation (vital signs are often normal; distinctly different from delirium tremens).
• Withdrawal Seizures (12 to 48 hours post-cessation): Generalized tonic-clonic seizures, typically singular or in a brief cluster (2 to 3 episodes). Treated acutely with IV benzodiazepines (e.g., lorazepam); standard anticonvulsants (phenytoin) are completely ineffective.
• Delirium Tremens (DTs) (48 to 96 hours post-cessation): Medical emergency with 5% to 15% mortality if untreated. Manifests as severe autonomic instability (severe hyperthermia, tachycardia $>120\text{ bpm}$, malignant hypertension, profuse drenching diaphoresis), global confusion, profound disorientation, and fluctuating delirium.

Inpatient vs. Outpatient Management Criteria

• Clinical Institute Withdrawal Assessment for Alcohol, Revised (CIWA-Ar):
  • Score $< 10$: Mild withdrawal (eligible for supportive outpatient management if reliable caregiver and daily clinical check-in are present).
  • Score $10–19$: Moderate withdrawal (requires pharmacotherapy; consider inpatient admission if comorbidities exist).
  • Score $\ge 20$: Severe withdrawal (mandates immediate inpatient admission, continuous cardiac telemetry, and aggressive symptom-triggered IV/oral benzodiazepines).
• Wernicke Encephalopathy Prophylaxis: All patients entering alcohol detoxification must receive high-dose parenteral thiamine (100–500 mg daily) PRIOR TO OR CONCURRENT WITH any intravenous dextrose solutions. Administering glucose to a thiamine-deficient patient rapidly exhausts remaining thiamine pyrophosphate cofactors for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase, precipitating acute irreversible Wernicke encephalopathy (confusion, ataxia, ophthalmoplegia/nystagmus) or Korsakoff psychosis (anterograde amnesia, confabulation).