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1. HOW TO INTERPRET ARTERIAL BLOOD GAS (ABGS)
STEP # 1: AcidosisvsNormal range vsAlkalosis
ACIDOSIS (ACIDEMIA) NORMAL RANGE ALKALOSIS (ALKALEMIA)
pH = < 7.35 pH = 7.35 – 7.45 pH = > 7.45
STEP # 2: MetabolicVsMixedVsRespiratory (ROMEMethod)
Rule : 1st Match pCO2, if pCO2 in Normal Range then Match HCO3
pH and pCO2 in Opposite
Direction
Normal Range pH pH and pCO2 in Same
Direction
Respiratory Mixed Metabolic
STEP # 3: CompensatingVsUncompensatedVsMixed
Respiratory (see HCO3) Mixed Metabolic(see pCO2)
1) Acidosis: 1) pCO2 & HCO3 1) Acidosis:
a) Compensating = HCO3
b) Uncompensated= HCO3 (Normal)
RespiratoryAcidosis
with
Metabolic Alkalosis
a) Compensating = pCO2
b) Uncompensated = pCO2 (Normal)
c) Metabolic Acidosis
with
RespiratoryAcidosis= pCO2
2) Alkalosis: 2) pCO2 & HCO3 2) Alkalosis:
a) Compensating = HCO3
b) Uncompensated= HCO3 (Normal)
RespiratoryAlkalosis
with
Metabolic Acidosis
a) Compensating = pCO2
b) Uncompensated = pCO2 (Normal)
c) Metabolic Alkalosis
with
RespiratoryAlkalosis = pCO2
3) HCO3 (normal range)
Metabolic Acidosis
with
Metabolic Alkalosis
4 ) Not Possible
RespiratoryAcidosis
with
RespiratoryAlkalosis