一位 28 歲厭食症個案因嚴重營養不良入院，下列哪個臨床發現最需要立即回報醫師？
A 28-year-old client with anorexia nervosa is admitted for severe malnutrition. Which finding is the most critical to report to the healthcare provider?
- ASerum potassium level of 2.8 mEq/L✓ 正解血清鉀濃度為 2.8 mEq/L
- BLanugo growth on the face面部出現胎毛
- CAmenorrhea for six months停經六個月
- DObsessive thoughts about food calorie content對食物熱量內容有強迫性想法
厭食症患者常因嘔吐或限制飲食導致電解質不平衡。低血鉀（2.8 mEq/L）會直接引發心律不整，是導致病人死亡的最直接危險因子。Lanugo、閉經及強迫思維是厭食症的常見臨床特徵，需長期治療與心理介入，但對生命威脅程度不及嚴重電解質紊亂。
Clients with anorexia nervosa often develop electrolyte imbalances due to vomiting or dietary restriction. Hypokalemia (a serum potassium of 2.8 mEq/L) can directly precipitate cardiac dysrhythmias and is the most immediate risk factor for sudden death. Lanugo, amenorrhea, and obsessive thoughts are common clinical features of anorexia nervosa that require long-term treatment and psychological intervention, but they are less life-threatening than severe electrolyte disturbances.
美護理師對於 critical lab value 有嚴格的通報與處理 protocol；台灣護理師回報後，常需等待醫師開立電解質補充醫囑。