ABG INTERPRETATION
STEP 1: PH determination
-

[H+] [HCO3 ]
Valid ABG = ---------------------- =24

P CO2

Normal 7.35 – 7...
To determine respiratory acidosis whether is acute or chronic:
ΔH
ΔPCO2
<0.3 Chronic Respiratory acidosis
>0.8 Acute Respi...
Respiratory compensation for metabolic disorder
Metabolic acidosis PCO2 = 1.5 × [HCO3-] + 8 ± 2
Metabolic alkalosis PCO in...
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Abg

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Abg

  1. 1. ABG INTERPRETATION STEP 1: PH determination - [H+] [HCO3 ] Valid ABG = ---------------------- =24 P CO2 Normal 7.35 – 7.45 (H+) = 80 – LAST 2 DIGITS OF Ph (eg:7.23) STEP 2: PH (7.34-7.45) ACIDOSIS ALKALOSIS RESPIRATORY METABOLOC CO2 HCO3- ACUTE RESPIRATORY METABOLIC CHRONIC Dr Ranjith Kumar/ ABG notes Page 1
  2. 2. To determine respiratory acidosis whether is acute or chronic: ΔH ΔPCO2 <0.3 Chronic Respiratory acidosis >0.8 Acute Respiratory acidosis 0.3 – 0.8 Acute on Chronic ΔH = Normal H+ (40) subtracted by Actual patient H+ ΔPco2 = (Patient PCo2 – 40) Step 3: Compensation Metabolic compensation for respiratory disorder Acidosis Alkalosis 1 2 ACUTE Acidosis Alkalosis 3.5 4 CHRONIC Co2 we will take as 10 in every step Respiratory acidosis Acute [HCO3-] increases by 1 for each 10-mm Hg increase in PCO2 Chronic [HCO3-] increases by 3.5 for each 10-mm Hg increase in PCO2 Respiratory alkalosis Acute [HCO3-] falls by 2 for each 10-mm Hg decrease in PCO2 Chronic [HCO - Dr Ranjith Kumar/ ABG notes 3 ] falls by 4 for each 10-mm Hg decrease in PCO2 Page 2
  3. 3. Respiratory compensation for metabolic disorder Metabolic acidosis PCO2 = 1.5 × [HCO3-] + 8 ± 2 Metabolic alkalosis PCO increases by 7 mm Hg for each 10 mEq/L increase in serum HCO 2 3 Met.Acidosis Normal Positive Anion gap Anion gap 10-12 MUDPILES Diarrhoea RTA urinary tract diversion Ammoniam chloride intake posthypocapnic Mixed disorder - Corrected HCO3 = Measured HCO3 + Anion gap - 12 HCO3- Dr Ranjith Kumar/ ABG notes Page 3

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