ABG Interpretation Quiz

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ABG interpretation

Analyze the following ABG

pH

7.49

CO₂

30

HCO₃^-

22

Primary problem

or

Metabolic

Respiratory

Combined

Acidosis

Alkalosis

Level of compensation

or

Partial

Full

Compensation

or

Metabolic

Respiratory

Acidosis

Alkalosis

Hint

Partial compensation means that the pH is still abnormal.

Full compensation means that the pH is back to normal.

Hint

The HCO₃^- is normal, so it is providing no compensation here.

Hint

If compensation is present, it's always the opposite of the primary problem (acidosis becomes alkalosis, metabolic becomes respiratory, etc.)

Hint

CO₂ is the respiratory component.
HCO₃^- is the metabolic component.

Hint

The pH is high (alkalotic), so the primary problem must be an alkalosis of some sort. What else here is alkalotic?

Hint

For an acidotic pH, the primary problem is acidotic components (CO₂ and/or HCO₃^-). Similarly, alkalotic components are what cause an alkalotic pH.

pH

pH

7.49

7.35-7.45

This pH is high (alkalotic). The other alkalotic piece (HCO₃^- and/or CO₂) is the primary cause.

CO₂

CO₂

30

35-45 mmHg

This CO₂ is low (alkalotic). The pH and CO₂ are both alkalotic, so the CO₂ is a primary cause.

30 mmHg = 4 kPa

HCO₃^-

HCO₃^-

22

22-26 mEq/L

This HCO₃^- is normal. The HCO₃^- is not providing any compensation against the low CO₂.

© 2007-2023 Adam Weinberger

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CO₂ Units:

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