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Blood CO2 consists of (4)
Dissolved CO2
Carbonic acid
Bicarbonate
Carbamino compounds
Dissolved CO2 % (1) names (2) and range (1)
5%
pCO2
dCO2
35-45 mmHg
Carbonic acid alternate name
H2CO3
dCO2/H2CO3 ratio
1000/1
Bicarbonate 5 (1) alternative name (1) and range (1)
65%
HCO3-
22-27 mEq/L
Carbamino compounds % and meaning
20-30%
CO2 bound to Hgb or albumin
Dissolved CO2 equation
dCO2 = pCO2 × 0.03 (Solubility coefficient)
HCO3-/ dCO2 ratio
20/1
HCO3- equation
Total CO2 - [PO2 × 0.03]
dCO2 = PO2 × 0.03
Total CO2 range
23-27 mmol/L