哪些檢驗值符合代謝性酸中毒？（選所有適合的）
Which lab results are consistent with metabolic acidosis? (Select all that apply.)
- ApH 7.28✓ 正解pH 7.28
- BHCO3- 18 mEq/L✓ 正解HCO3- 18 mEq/L
- CPaCO2 35 mmHg✓ 正解PaCO2 35 mmHg
- DPaO2 95 mmHgPaO2 95 mmHg
- EHCO3- 30 mEq/LHCO3- 30 mEq/L
代謝性酸中毒的核心生化標記為 pH < 7.35（A. 7.28 符合）與 HCO3- < 22 mEq/L（B. 18 mEq/L 符合）。呼吸代償會使 PaCO2 下降；雖然 35 mmHg 處於正常範圍下限（35-45），但在代謝性酸中毒情境下被視為早期代償徵象，故 C 仍為合理選項。D. PaO2 與酸鹼判讀無直接關聯；E. HCO3- 30 mEq/L 升高為代謝性鹼中毒指標，與題意相反。
The core biochemical markers of metabolic acidosis are pH < 7.35 (A. 7.28 meets this criterion) and HCO3- < 22 mEq/L (B. 18 mEq/L meets this criterion). Respiratory compensation lowers PaCO2; although 35 mmHg is at the lower end of the normal range (35-45), in the setting of metabolic acidosis it is regarded as an early sign of respiratory compensation, so option C is still a reasonable choice. D. PaO2 has no direct relationship with acid-base interpretation; E. HCO3- of 30 mEq/L is elevated and indicates metabolic alkalosis, which is the opposite of what the question asks.