Anorexia nervosa

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Target exams

Red flags

• Medical instability — severe bradycardia, hypotension, hypothermia, syncope, arrhythmia or prolonged QTc — same-day senior medical review and likely admission
• Rapid weight loss, profound malnutrition, or severe electrolyte derangement (especially low phosphate, potassium, magnesium) — refeeding risk pathway
• Acute suicidality, intent/plan, or high-lethality self-harm — psychiatric emergency pathway alongside medical stabilisation
• Treatment refusal with impaired capacity and life-threatening risk — decision-specific capacity assessment and jurisdiction-specific compulsory frameworks
• Unsupervised exercise or discharge while still bradycardic/electrolyte-unstable — sudden cardiac death risk
• Missed refeeding hypophosphataemia after nutrition restart — daily labs and proactive replacement in high-risk patients