This chart will help you determine a patients pH status with the data gathered from their ABG's.
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We'll start with just the pH. Is the pH...
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...below 7.35?
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OR...above 7.45?
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YES
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YES
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Then it's Acidotic. Now, we determine if your patient has respiratory or metabolic acidosis. Look at their pH, PaCO2, and HCO3-.
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Then it's Alkalotic. Now we determine if your patient has respiratory or metabolic acidosis. Look at their pH, PaCO2, and HCO3-.
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Do they have a LOW pH and a HIGH CO2? (CO2 above 45)
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OR do they have a LOW pH and a LOW HCO3-? (HCO3- below 22)
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Do they have a HIGH pH and a LOW CO2? (CO2 under 35)
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OR do they have a HIGH pH and a HIGH HCO3-? (HCO3- above 26)
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YES
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YES
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YES
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YES
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Respiratory Acidosis
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Metabolic Acidosis
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Respiratory Alkalosis.
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Metabolic Alkalosis
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...their CO2 is within 35-45 and their HCO3- is outside of 22-26, then they are UNCOMPENSATED.
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Now determine their degree of compensation.
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The options are... Compensated, Uncompensated, or Partially Compensated.
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Now determine their degree of compensation.
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If you established that your patient has either Respiratory Acidosis or Alkalosis, then is their HCO3- outside of 22-26? If yes, then they are PARTIALLY COMPENSATED.
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their HCO3- is within 22-26 and their CO2 is outside of 35-45, then they are UNCOMPENSATED.
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If their pH is outside of 7.35-7.45 AND...
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OR, if their pH is between 7.35-7.45 then they are COMPENSATED.
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OR, they could be PARTIALLY COMPENSATED...
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If you established that your patient has either Metabolic Acidosis or Alkalosis, then is their CO2 outside of 35-45? If yes then they are PARTIALLY COMPENSATED.
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Determining pH status of a patient with ABG's
