3. standard bicarbonate(sb and actual bicarbonate (aB) SB: HCO 31 in plasma under standard condition (38C; PO2=150mmHg; PCO2=40mmHg) AB: HCO 3 in plasma under actual condition Normal range: 22-27 mmol/L; AB=SB 4. buffer base (bb) sum of all buffer base in blood normal range: 45-55mmol/L 5. base excess(be) normal range:±3mmo/L3. standard bicarbonate(SB) and actual bicarbonate(AB) SB: [HCO- 3] in plasma under standard condition (38℃; PO2=150mmHg; PCO2=40mmHg) AB: [HCO- 3] in plasma under actual condition Normal range: 22~27mmol/L ; AB=SB 4. buffer base(BB) sum of all buffer base in blood normal range: 45 ~ 55mmol/L 5. base excess(BE) normal range: ±3mmol/L