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8 Cards in this Set
- Front
- Back
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Assumptions for this method
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1. You know normal ranges for pH, PaO2, PaCO2, and HCO3
2. You know effect on pH of increased or decreased PaCO2 and HCO3 3. Mixed Acid/Base disturbances not present |
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If not normal, ABG interpretation will be applicable terms expressed in reverse order.
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First – Compensation (compensated or uncompensated), if any?
If so, to what degree (partial or fully)? Second – Source (metabolic or respiratory) of Acid/Base disturbance, if any? Third – Type (acidosis or alkalosis) of Acid/Base disturbance, if any? Forth – Hypoxemia (mild or severe), if any? |
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Step 1: Is this ABG normal or abnormal?
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B. Are any of them abnormal?
i. If no abnormal(s), ABG is NORMAL (stop) ii. If any abnormal(s), go to Step 2 |
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Step 2: Is hypoxemia present?
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A. Is PaO2 < 80 ?
i. If < 80 there is a HYPOXEMIA |
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Step 3: Is there an Acid/Base disturbance?
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A. Are either PaCO2 or HCO3 abnormal?
i. If NO, only Hypoxemia was present (stop) ii. If YES, go to 3-B B. Is pH > or < than 7.40 i. > 7.40 means this ABG will be an ALKALOSIS ii. <7.40 means this ABG will be an ACIDOSIS |
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Step 4: Which abnormal (PaCO2 or HCO3) could cause this disturbance?
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A. If PaCO2 is responsible, disturbance is RESPIRATORY
B. If HCO3 is responsible, disturbance is METABOLIC |
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Step 5: any compensation for the disturbance?
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A. Is the parameter NOT responsible for the disturbance abnormal?
i. If NO, disturbance is UNCOMPENSATED (stop) ii. If YES, go to Step 6 |
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Step 6: To what degree has there been compensation?
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A. If pH > 7.45 or < 7.35 disturbance is PARTIALY COMPENSATED
B. If pH WNL (7.35-7.45) disturbance is FULLY COMPENSATED |
