Nursebob’s MICU/CCU Survival Guide
Pulmonary Concepts In Critical Care
Normal Arterial Blood Gas Values
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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