兒科病房的指定護理長正在檢閱早晨的實驗室檢驗結果，以建立照護的優先順序。下列哪位病患的實驗室發現需要跨科別醫療團隊『最立即』的介入處理？
A designated charge nurse on a pediatric unit is reviewing morning laboratory results to establish care priorities. Which client's laboratory finding warrants the most immediate intervention by the interdisciplinary medical team?
- AAn 8-year-old child admitted with acute gastroenteritis exhibiting a serum potassium level of 3.8 mEq/L.因急性腸胃炎入院且血清鉀濃度為3.8 mEq/L的8歲兒童。
- BA 10-year-old child diagnosed with severe sickle cell crisis possessing a hemoglobin of 8.5 g/dL.診斷為嚴重鐮狀細胞危機且血色素為8.5 g/dL的10歲兒童。
- CA 6-year-old child receiving chemotherapy for acute leukemia showing an absolute neutrophil count (ANC) of 400/mm³.✓ 正解接受急性白血病化學治療且絕對嗜中性白血球計數（ANC）為400/mm³的6歲兒童。
- DA 4-year-old toddler post-tonsillectomy demonstrating a normal platelet count measuring 250,000/mm³.扁桃腺切除術後血小板計數正常為250,000/mm³的4歲幼兒。
本題測驗由異常檢驗數值建立優先順序 (Establishing Priorities / Lab Values)。在管理與檢傷中，護理師必須抓出「立即致命 (Life-threatening)」的指標。選項 A：正常血鉀為 3.5 - 5.0 mEq/L，這名急性腸胃炎的孩童血鉀 3.8，屬於正常且穩定的範圍。選項 B：鐮狀細胞危機 (Sickle Cell) 孩童的血紅素 8.5 g/dL。正常成/小兒多在 11-15 以上，雖然 8.5 屬於貧血，但鐮狀細胞病患的 Baseline 本來就處於慢性貧血狀態 (通常在 7-10 之間遊走)，這是預期的情形，沒有立刻休克的危險。選項 D：正常血小板為 150,000 到 400,000，扁桃腺切除術後 25 萬非常正常，無出血危機。選項 C：絕對嗜中性白血球 (ANC) 的正常值通常應大於 1000 - 1500。當 ANC 低於 500 時，代表極重度白血球低下 (Severe Neutropenia)，這名孩童完全失去了抵抗力，即使是正常環境下的微小細菌也能在幾小時內引發不可逆的敗血性休克致死。這絕對需要醫療團隊立即祭出最高防護與隔離介入。
This item tests prioritization based on abnormal laboratory values. In management and triage, the nurse must identify the immediately life-threatening indicator. Option A: Normal serum potassium is 3.5-5.0 mEq/L; this child with acute gastroenteritis has a potassium of 3.8, which is normal and stable. Option B: A child in sickle cell crisis with hemoglobin 8.5 g/dL. Normal adult/pediatric hemoglobin is typically 11-15 g/dL or higher. Although 8.5 represents anemia, sickle cell clients have a chronically anemic baseline (often 7-10), so this is expected and not an immediate shock risk. Option D: Normal platelets are 150,000-400,000; a post-tonsillectomy count of 250,000 is normal with no bleeding risk. Option C: Absolute neutrophil count (ANC) is typically considered normal above 1000-1500. An ANC below 500 represents severe neutropenia; this child has essentially no defense against infection, and even normal environmental bacteria could cause irreversible septic shock within hours. This client absolutely requires the medical team's immediate maximum protection and isolation.
對於「最高危險急症數值」的捕捉。ANC (Absolute Neutrophil Count) 是 NCLEX 必考的核心數值。只要看到 ANC < 500 或 WBC 極低，永遠優先處理，世界通用。