Nursebob’s
MICU/CCU Survival Guide
Pulmonary
Concepts In Critical Care
20.11.05
Normal ABG Values
pH: 7.35 - 7.45
PCO2: 35 - 45 mmHg
PO2: >80 mmHg
HCO3: 22 - 28 mEq/L
Note: Each institution publishes its own values for specific tests. Be
sure to look up the values that are accepted for your
facility.
Arterial Blood Gasses and
Compensatory Mechanisms |
||||
Normal
Value |
pH:
7.35-7.45 |
PCO2:
35 - 45 mmHg |
NaHCO3:
22 - 28mmHg/L |
Compensation |
Respiratory
Alkalosis |
up |
down |
normal
until compensation |
Kidneys
will decrease NaHCO3. This
cannot be done quickly. |
Respiratory
Acidosis |
down |
up |
normal
until compensation |
Kidneys
will increase NaHCO3. This
cannot be done quickly. |
Metabolic
Alkalosis |
up |
normal
until compensation |
up |
Lungs
will try to increase CO2. This
can be done quickly. |
Metabolic
Acidosis |
down |
normal
until compensation |
down |
Lungs
will try to decrease CO2. This
can be done quickly. |
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