Cheat sheet

CARN Cheat Sheet

Quick Facts

Exam
CARN
Credential
Certified Addictions Registered Nurse
Items
150 (about 25 pilot)
Time
3 hours
Pass
75% of scored items
Standard
Angoff-set, no scaled score
Delivery
PSI test centers
Applications
C-NET, online only
Fee
$300; $250 member
Eligibility
RN + 2,000 hours
CE
30 hours; 51% addictions
Window
90-day testing window
Retake
30 days after attempt
Validity
4 years
Pass rate
70% in 2025
Blueprint
Implemented 2026

CAGE

Cut down, Annoyed, Guilty, Eye-opener

2+ is a positive screenLifetime, not currentPair with AUDIT-C

Tolerance vs Dependence

Tolerance

  • Needs more for effect
  • Receptor adaptation
  • Occurs on prescribed opioids

Dependence

  • Withdrawal on stopping
  • Physiologic adaptation
  • Not addiction by itself

Neither alone means addiction

Patient Problem Weights

Opioid
27% of items40-42
Alcohol
25% of items37-39
Stimulant
15% of items22-24
Co-occurring
12% of items19-21
Medication misuse
10% of items15-17
Cannabinoids
6% of items9-11
Tobacco
5% of items7-9

CRAFFT

Car, Relax, Alone, Forget, Friends, Trouble

Ages 12-21Score 2+ is positiveAlcohol and drugs together

Screening Tools + Cut-offs

AUDIT
10 items; 8+ is positive
AUDIT-C
3 items; 4+ men, 3+ women
CAGE
4 items; 2+ significant
DAST-10
3-5 moderate; 6-8 substantial
CRAFFT
Ages 12-21; 2+ positive
ASSIST
4-26 moderate; 27+ high
CUDIT-R
8+ hazardous; 12+ likely disorder
SBIRT
Screen, brief intervene, refer
Screen vs diagnose
Screens stratify risk only

DSM-5-TR SUD Criteria

Criteria count
11 within 12 months
Mild
2-3 criteria
Moderate
4-5 criteria
Severe
6+ criteria
Four clusters
Control, social, risky, pharmacologic
Prescribed opioid
Tolerance, withdrawal excluded
Craving
Strong desire to use
Substance-induced
Clears after acute withdrawal
Independent disorder
Persists roughly one month

Alcohol Withdrawal Clock

6-12 tremor, 12-48 seizure, 48-72 DTs

Hallucinosis 12-24 hoursSensorium clear in hallucinosisDTs are a medical emergency

CIWA-Ar vs COWS

CIWA-Ar

  • Alcohol withdrawal
  • 10 items, max 67
  • Needs reliable self-report

COWS

  • Opioid withdrawal
  • 11 items, 0-48
  • Observer-rated signs

Alcohol self-report vs opioid signs

Withdrawal Management Picker

  1. Alcohol, CIWA-Ar 8+Symptom-triggered benzodiazepine(Reassess hourly)
  2. Alcohol plus liver diseaseLorazepam or oxazepam(No active metabolites)
  3. Patient cannot self-reportFixed-schedule dosing(CIWA-Ar invalid)
  4. Opioid withdrawal, COWS 8+Start buprenorphine(Avoids precipitated withdrawal)
  5. Wants methadone maintenanceRefer to OTP(Federally regulated dispensing)
  6. Long-term benzodiazepine useSlow taper, never abrupt(5-10% every 1-4 weeks)
  7. Stimulant crashSupport, screen suicidality(No titration scale exists)
  8. Inpatient smoker admittedOffer NRT early(Peaks days 2-3)
  9. Neonate showing withdrawalEat, Sleep, Console(Rooming-in before medication)

CIWA-Ar + COWS Bands

CIWA-Ar
10 items; max 67
CIWA-Ar treat
Benzodiazepine at 8-10
CIWA-Ar invalid
Cannot self-report reliably
COWS
11 items; 0-48
COWS 5-12
Mild withdrawal
COWS 13-24
Moderate withdrawal
COWS 25-36
Moderately severe withdrawal
COWS 37+
Severe withdrawal
Buprenorphine gate
COWS 8+ before dosing
Trend rule
Serial scores beat one

Withdrawal Timelines

Alcohol tremor
6-12 hours after last drink
Alcoholic hallucinosis
12-24 hours; sensorium clear
Withdrawal seizures
12-48 hours
Delirium tremens
48-72 hours; clouded consciousness
Short-acting opioids
Onset 8-12 hours
Methadone withdrawal
Onset 24-48 hours; prolonged
Nicotine withdrawal
Peaks days 2-3
Cannabis withdrawal
Peaks first week
Stimulant crash
Dysphoria, fatigue, vivid dreams

Overdose + Emergency Rules

Opioid overdose triad
Coma, pinpoint pupils, apnea
Naloxone nasal
4 mg; repeat 2-3 minutes
Naloxone duration
30-90 minutes; observe after
Xylazine
Alpha-2 agonist; naloxone cannot reverse
Stimulant agitation
Benzodiazepine first-line
Flumazenil
Avoid; can precipitate seizures
Thiamine timing
Before or with glucose
Fever plus injection
Rule out infective endocarditis
Cocaethylene
Cocaine plus alcohol; cardiotoxic
Gabapentinoid plus opioid
Additive respiratory depression

ASAM Six Dimensions

Intox, Bio, Psych, Risk, Environment, Person

Fourth edition, 2023Readiness folded into risksLeast intensive safe level

Buprenorphine vs Methadone

Buprenorphine

  • Partial agonist
  • Ceiling on respiration
  • Office-based prescribing

Methadone

  • Full agonist
  • No ceiling effect
  • OTP dispensing only

Partial office vs full OTP

Level of Care Picker

  1. Emergent medical instabilityLevel 4(Hospital inpatient)
  2. Acute psychiatric emergencyLevel 4 Psychiatric(Skilled psychiatric management)
  3. Needs IV fluids, wound careLevel 3.7 BIO(Biomedical capability added)
  4. Needs 24-hour withdrawal nursingLevel 3.7(Medically managed residential)
  5. Unsafe home, needs containmentLevel 3.5(High-intensity residential)
  6. Housing gap, clinically stableLevel 3.1(Low-intensity residential)
  7. Needs near-daily structureLevel 2.5(High-intensity outpatient)
  8. Structured groups, sleeps homeLevel 2.1(Intensive outpatient)
  9. Stable, weekly therapyLevel 1.5(Outpatient therapy)
  10. Stable on medication aloneLevel 1.0(Long-term remission monitoring)

MOUD Agents + Rules

Methadone
Full agonist; OTP only
Methadone first day
Up to 50 mg
Buprenorphine
Partial agonist; high affinity
Buprenorphine prescriber
DEA Schedule III authority
X-waiver
Eliminated by 2023 law
XR-naltrexone
Antagonist; 380 mg monthly
Naltrexone washout
7-10 opioid-free days
Best outcome measure
Retention in treatment
Telehealth start
Permitted; methadone needs audio-visual

Naltrexone vs Naloxone

Naltrexone

  • Long-acting antagonist
  • Treatment, not rescue
  • Oral or monthly injection

Naloxone

  • Short-acting antagonist
  • Overdose rescue only
  • Lasts 30-90 minutes

Maintenance vs rescue

MOUD Selection Picker

  1. Severe OUD, wants structureMethadone(Daily OTP dosing)
  2. Wants office-based flexibilityBuprenorphine(Any Schedule III prescriber)
  3. Committed to full abstinenceXR-naltrexone(7-10 opioid-free days first)
  4. Pregnant with OUDMethadone or buprenorphine(Continue through postpartum)
  5. Leaving jail or detoxStart before discharge(Tolerance already lost)
  6. Urine positive during treatmentIntensify support(Do not discharge)
  7. Surgery or analgesia plannedAvoid naltrexone(Blocks opioid analgesia)

AUD + Tobacco Medications

Naltrexone AUD
50 mg oral daily
Acamprosate
666 mg three times daily
Renal vs hepatic
Acamprosate renal, naltrexone hepatic
Disulfiram
Blocks aldehyde dehydrogenase
Disulfiram reaction
Flushing, vomiting, tachycardia, hypotension
Hidden alcohol
Mouthwash, cough syrup, sauces
Varenicline
Most effective single agent
Combination NRT
Patch plus short-acting form
Nicotine patch steps
21, 14, 7 mg
Bupropion SR
Begin before quit date

ASAM Fourth Edition Levels

Level 1.0
Long-term remission monitoring
Level 1.5
Outpatient therapy
Level 1.7
Medically managed outpatient
Level 2.1
Intensive outpatient
Level 2.5
High-intensity outpatient
Level 2.7
Medically managed intensive outpatient
Level 3.1
Low-intensity residential
Level 3.5
High-intensity residential
Level 3.7
Medically managed residential
Level 4
Medically managed inpatient
COE tag
Co-occurring enhanced program
BIO tag
Added biomedical capability
Level 0.5
Removed in fourth edition

ASAM Six Dimensions

Dimension 1
Intoxication, withdrawal, addiction medications
Dimension 2
Biomedical conditions
Dimension 3
Psychiatric and cognitive conditions
Dimension 4
Substance use-related risks
Dimension 5
Recovery environment interactions
Dimension 6
Person-centered considerations
Readiness to change
No longer a dimension
Placement rule
Least intensive safe level

OARS

Open, Affirm, Reflect, Summarize

Engage, focus, evoke, planResist the righting reflexPlanning comes last

Precontemplation vs Contemplation

Precontemplation

  • No problem seen
  • Not considering change
  • Raise awareness only

Contemplation

  • Ambivalent about change
  • Weighing pros and cons
  • Explore, do not push

Unaware vs ambivalent

Behavior Change Picker

  1. Sees no problemRaise awareness gently(Precontemplation)
  2. Ambivalent about quittingExplore both sides(Contemplation)
  3. Ready within one monthBuild a concrete plan(Preparation)
  4. Recently stopped usingReinforce skills, monitor closely(Action)
  5. Six months abstinentBuild recovery capital(Maintenance)
  6. Declines all treatmentOffer harm reduction(Keep the door open)

MI + Stages of Change

OARS
Open, affirm, reflect, summarize
MI processes
Engage, focus, evoke, plan
Righting reflex
Resist arguing for change
Precontemplation
No problem recognized
Contemplation
Ambivalent, weighing change
Preparation
Intends change within month
Action
Changed under six months
Maintenance
Sustained beyond six months
Rulers
Rate importance and confidence
Change talk
Reflect and reinforce it

Stages of Change

Pre, Contemplation, Preparation, Action, Maintenance

Match intervention to stageDo not skip aheadRelapse is a recycle

Harm Reduction Essentials

Naloxone access
Nasal spray sold over-the-counter
Fentanyl test strips
Detect fentanyl before use
Syringe services
Cut HIV and hepatitis
Never use alone
Overdose needs a witness
Highest overdose risk
After jail, detox, hospital
Tolerance loss
Former dose now lethal
Standard drink
14 grams pure alcohol
Binge drinking
4 women, 5 men
Heavy drinking
8 women, 15 men weekly
Hepatitis C
Treat despite active use

Methadone Take-Home Ladder

7 days, then 14 days, then 28 days

Days 1-14: up to 7Day 15+: up to 14Day 31+: up to 28Ceilings, not entitlements

Lapse vs Relapse

Lapse

  • Single use event
  • Has a learnable trigger
  • Reframe and plan ahead

Relapse

  • Return to prior pattern
  • Follows the guilt spiral
  • Needs plan revision

One slip is not failure

Pregnancy + Neonatal Rules

OUD in pregnancy
Continue methadone or buprenorphine
Supervised withdrawal
Not recommended during pregnancy
Third trimester
Dose often must rise
NOWS
Neonatal opioid withdrawal syndrome
Eat Sleep Console
Function-based, non-drug first
Finnegan
Symptom-count neonatal scoring tool
Breastfeeding
Encouraged unless contraindicated
Older adults
Avoid benzodiazepines and Z-drugs
Safer benzodiazepines
Lorazepam, oxazepam, temazepam

Part 2 vs HIPAA

42 CFR Part 2

  • SUD program records
  • Blocks legal use
  • One consent since 2024

HIPAA

  • All health records
  • Broad treatment disclosure
  • No court-order shield

Extra shield for SUD records

Relapse Prevention + Support

Lapse
Single discrete use event
Relapse
Return to prior pattern
Abstinence violation effect
Guilt drives full return
Urge surfing
Ride craving without acting
Recovery capital
Resources sustaining long-term recovery
AA
Twelve steps, sponsor, spirituality
SMART Recovery
Secular, cognitive-behavioral, four points
Contingency management
Best for stimulant disorder
Integrated care
One team, both conditions

Common Traps

Naloxone vs naltrexone

Naloxone reverses acute overdose Naltrexone maintains ongoing abstinence

Screen vs diagnose

AUDIT and DAST screen risk DSM-5-TR criteria diagnose

Dependence vs addiction

Dependence is physiologic adaptation Addiction adds compulsive harmful use

Early buprenorphine dosing

Waiting prevents precipitated withdrawal Dose only at COWS 8+

Reversal reflex

Opioid overdose gets naloxone Benzodiazepine overdose gets airway support

Glucose before thiamine

Thiamine first or together Glucose alone precipitates Wernicke

Positive urine screen

Not a discharge trigger Intensify support and monitoring

Stimulant withdrawal scale

No CIWA-Ar equivalent exists Screen suicidality during crash

Detox equals treatment

Withdrawal management only stabilizes Medication and care must follow

Last Minute

  1. 1.Care management domain is 35%
  2. 2.Acute care needs domain is 20%
  3. 3.Opioid 27%, alcohol 25% of items
  4. 4.CIWA-Ar is alcohol; COWS is opioid
  5. 5.Buprenorphine only when COWS 8+
  6. 6.Naltrexone needs 7-10 opioid-free days
  7. 7.Thiamine before or with glucose
  8. 8.Naloxone wears off before fentanyl
  9. 9.Sedative withdrawal can be fatal
  10. 10.Contingency management for stimulant disorder
  11. 11.Retention on MOUD is the outcome
  12. 12.Pregnancy: continue methadone or buprenorphine
  13. 13.Pick the least intensive safe level
  14. 14.Part 2 shields SUD treatment records
  15. 15.Person-first language on every item
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