Alcohol use disorder (AUD) is diagnosed when a person meets at least 2 of 11 specific criteria within the same 12-month period. There is no single blood test or brain scan that confirms the diagnosis. Instead, clinicians use a combination of structured questionnaires, a detailed drinking history, a physical exam, and sometimes blood work to build a complete picture.
The 11 Diagnostic Criteria
The current diagnostic framework lists 11 symptoms. A clinician will ask whether, in the past year, you have:
- Drunk more or for longer than you intended
- Tried to cut down or stop more than once and couldn’t
- Spent a lot of time drinking, being sick from drinking, or recovering from its effects
- Experienced cravings or strong urges to drink
- Found that drinking interfered with taking care of your home, family, job, or school
- Continued drinking even though it caused problems with family or friends
- Given up or cut back on activities that mattered to you in order to drink
- Gotten into situations while or after drinking that increased your chances of being hurt
- Continued drinking even though it made you feel depressed or anxious, or after a memory blackout
- Needed to drink more than you once did to get the same effect (tolerance)
- Experienced withdrawal symptoms when the alcohol wore off, such as trouble sleeping, shakiness, nausea, sweating, or a racing heart
The number of criteria you meet determines severity. Two to three symptoms qualifies as mild AUD. Four to five is moderate. Six or more is severe. This replaced an older system that split problems into “alcohol abuse” and “alcohol dependence” as separate diagnoses, which often left people in a gray area where they clearly had a problem but didn’t fit neatly into either box.
Screening Questionnaires
Most diagnoses start with a short screening tool, often completed in a primary care office before you even see the doctor. The U.S. Preventive Services Task Force recommends that all adults 18 and older be screened for unhealthy alcohol use during routine visits.
The most widely used brief screen is the AUDIT-C, which contains just three questions about how often you drink, how many drinks you have on a typical day, and how often you have six or more drinks on one occasion. It’s scored on a scale of 0 to 12. A score of 4 or higher in men, or 3 or higher in women, flags possible hazardous drinking or an active alcohol use disorder.
Another common tool is the CAGE questionnaire, a four-question screen that asks whether you’ve ever felt you should Cut down, been Annoyed by criticism of your drinking, felt Guilty about it, or needed an Eye-opener first thing in the morning. The CAGE is fast but has notable limitations. Research in the Journal of General Internal Medicine found it performs inconsistently across gender and racial groups, making it a weaker “rule-out” test. It was most accurate among African-American women and least accurate among African-American men. A positive screen on either tool doesn’t mean you have AUD, but it does prompt a deeper conversation.
The Drinking History Interview
A positive screen leads to a more detailed clinical interview. This is the core of the diagnostic process. The clinician will typically walk through your drinking patterns in a specific sequence: where you drink, how often, and then how much. Starting with frequency and setting tends to produce more accurate answers than jumping straight to “how many drinks per day,” which can feel confrontational and lead to underreporting.
Beyond quantity and frequency, the interview explores consequences. Has drinking caused problems at work or school? Has it strained relationships? Have family members or friends expressed concern? Has your social life narrowed around drinking? The clinician is essentially mapping your answers onto those 11 diagnostic criteria, looking for a pattern that fits.
Honesty matters here more than anywhere else in the process. Screening tools and blood tests can hint at a problem, but only the interview captures the full scope of how alcohol is affecting your life. Clinicians are trained to ask these questions without judgment, and the answers are protected health information.
Physical Exam Findings
A physical exam can reveal signs that support the diagnosis, though none of them are definitive on their own. Doctors look for facial flushing, small visible blood vessels on the skin (especially the face and nose), swelling around the eyes or in the salivary glands, poor nutrition, and signs of vitamin deficiency. Bruises in various stages of healing, elevated blood pressure, and a general appearance of poor self-care can also raise concern.
In more advanced cases, signs of liver damage appear: yellowing of the skin and eyes, an enlarged liver detectable by touch, and tremors or sweating that suggest the body has become physically dependent on alcohol and is in early withdrawal. These findings don’t diagnose AUD by themselves, but they add clinical weight to the picture emerging from the interview and screening tools.
Blood Tests That Support the Diagnosis
No blood test alone can diagnose AUD, but several markers rise with chronic heavy drinking and help clinicians gauge the extent of physical harm.
A liver enzyme called GGT is one of the most commonly checked. It rises in about 75% of people with alcohol addiction who drink more than roughly 3 standard drinks per day consistently, and in people with alcoholic liver disease it can climb to more than ten times the normal level. Two other liver enzymes, AST and ALT, typically rise to 2 to 4 times above normal in people who drink heavily, and higher still in alcoholic hepatitis.
Red blood cell size (MCV) increases after drinking more than about 4 to 5 standard drinks a day for at least a month, though even smaller amounts over time can nudge it upward compared to abstinence. A protein marker called CDT is considered more sensitive than GGT for detecting relapse because drinking 4 or more standard drinks a day for as little as one week can raise it significantly, and even small amounts of alcohol after a period of abstinence can push it back up quickly.
A blood alcohol concentration at or above 1 per mille (roughly 0.1%) found during a routine visit, or above 1.5 per mille without visible signs of intoxication, suggests significant tolerance, which is itself one of the 11 diagnostic criteria.
Ruling Out Other Conditions
Many symptoms of AUD overlap with other psychiatric conditions, which makes sorting them apart an important step. Depression, anxiety, trauma-related disorders, sleep problems, and other substance use disorders are the most common conditions that co-occur with AUD. Bipolar disorder, ADHD, and psychotic disorders like schizophrenia also overlap more often than chance would predict.
The tricky part is that alcohol itself causes many of these same symptoms. Cycles of drinking, withdrawal, and craving routinely produce sleep disruption, sadness, irritability, worry, and low mood. A clinician needs to determine whether these symptoms exist independently of drinking or are primarily driven by it. Sometimes that distinction only becomes clear after a period of reduced drinking or abstinence.
When someone shows signs of psychosis, clinicians will also look for medical complications of heavy drinking that can mimic psychiatric illness, including seizures, bleeding inside the skull, and liver-related confusion. These are medical emergencies rather than psychiatric diagnoses, and they require different treatment.
What the Diagnosis Actually Looks Like
In practice, diagnosis often happens in stages. A routine primary care visit includes a brief screen. A positive score triggers a longer conversation. The clinician compares your answers against the 11 criteria, reviews any physical findings and lab results, and considers whether another condition better explains what’s happening. If you meet 2 or more criteria within the past year, the diagnosis is made and classified as mild, moderate, or severe.
The entire process can happen in a single appointment, though complex cases with overlapping mental health conditions may take longer to untangle. There’s no imaging study or genetic test involved. The diagnosis rests primarily on your reported experience, supported by whatever physical and laboratory evidence is available. That makes it more subjective than, say, diagnosing diabetes from a blood sugar level, but the criteria have been validated across large populations and provide a reliable framework for identifying who needs help and how urgently.