pH:7.4+-.03
pCO2:40+-5mmHg
HCO3-:24+-4
3 STEPS
1.Find the primary defect
Metabolic Acidosis- Decreased HCO3-
Metabolic Alkalosis- Increased HCO3-
Respiratory Acidosis- Increased PCO2
Respiratory Alkalosis-Increased PCO2
2.Find the Compensation
Metabolic acidosis(Dec HCO3-)- For every 1meq fall in HCO3-,PCO2 falls by 1mmHg
Metabolic Alkalosis- For every 1meq rise of HCO3-,PCO2 rises by 0.6mmHg
Respiratory Acidosis- For every 10mmHg rise of PCO2
- HCO3- rises by 1meq in acute
- HCO3- rises 4meq in c/c
Respiratory Alkalosis-For every 10mmHg fall of PCO2
HCO3- falls by 2meq in acute RA
HCO3- falls by 4 meq in c/c RA
3.Check whether compensation is adequate/whether there is overcompensation.
Hydrogen Ion concentrations at different pH
pH [H]
7.0 – 100
7.1- 80
7.2- 64
7.3- 50
7.4 – 40
7.5 – 32
7.6 – 26
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