Regarding the clinical features and assessment of opioid use disorder, all of the following are recognized diagnostic criteria or clinical findings EXCEPT:

Explanation

## Opioid Use Disorder: Diagnosis and Clinical Features **Key Point:** A positive urine drug screen (UDS) for opioids indicates opioid use but does NOT diagnose opioid use disorder. Diagnosis requires clinical assessment using DSM-5 criteria, which evaluate the pattern of use, loss of control, continued use despite harm, and functional impairment. ### Diagnostic Criteria vs. Drug Screening | Finding | Meaning | Diagnostic Value | | --- | --- | --- | | Positive UDS for opioids | Opioid present in urine (past 2–3 days) | Confirms recent use; does NOT diagnose disorder | | DSM-5 criteria (≥2 symptoms in 12 months) | Maladaptive pattern of use with clinical/functional consequences | Diagnostic for opioid use disorder | | Tolerance + withdrawal + craving | Neurobiological dependence | Supports but is not sufficient alone for diagnosis | **High-Yield:** The distinction between **opioid use**, **opioid dependence** (physical/psychological), and **opioid use disorder** is critical. A patient may test positive for opioids (use) or experience withdrawal (dependence) without meeting criteria for use disorder. Conversely, someone with opioid use disorder may not have detectable opioids in their system at the time of testing. ### Clinical Features of Opioid Withdrawal **Key Point:** Opioid withdrawal is extremely uncomfortable but NOT life-threatening (unlike alcohol or benzodiazepine withdrawal). The classic triad: 1. **Autonomic hyperactivity:** mydriasis (dilated pupils), lacrimation, rhinorrhea, diaphoresis, tachycardia, hypertension 2. **Musculoskeletal:** myalgias, arthralgias, muscle spasms 3. **Psychological:** anxiety, insomnia, dysphoria, irritability, craving **Clinical Pearl:** Miosis (pinpoint pupils) is a sign of opioid intoxication/overdose. During withdrawal, pupils dilate (mydriasis) — this is the opposite and is a key distinguishing feature. ### Tolerance in Opioid Use **Mnemonic:** TERM — **T**olerance to Euphoria, **E**uphoria lost, **R**espiratory depression tolerance develops, **M**iosis (pupil constriction) — NO tolerance. **Key Point:** Tolerance develops to most opioid effects (analgesia, euphoria, respiratory depression, nausea) but does NOT develop to the miotic effect. This is why chronic opioid users maintain pinpoint pupils even after years of use and high doses. ### DSM-5 Severity Classification | Severity | Symptom Count (12-month period) | | --- | --- | | Mild | 2–3 symptoms | | Moderate | 4–5 symptoms | | Severe | ≥6 symptoms | **Warning:** Presence of opioid metabolites in urine is NOT diagnostic. A patient prescribed opioids for pain, a patient in methadone maintenance, and a patient with opioid use disorder may all test positive. Clinical history, functional impairment, and loss of control are essential.