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1 Arterial Blood Gas Fundamentals and Interpretation Online Quiz Questions

Use this free practice quiz with 20 questions to review 1 Arterial Blood Gas Fundamentals and Interpretation, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

An ABG shows pH 7.29, PaCO₂ 55 mm Hg, and HCO₃⁻ 25 mEq/L. Which interpretation best matches the pH and the component directions?

  1. A

    Metabolic-acidosis pattern with alkalemia

  2. B

    Respiratory-acidosis pattern with acidemia

  3. C

    Respiratory-alkalosis pattern with acidemia

  4. D

    Metabolic-alkalosis pattern with acidemia

02
Written response
1 point

An ABG shows pH 7.28, PaCO₂ 30 mm Hg, and HCO₃⁻ 14 mEq/L. What primary acid–base pattern does the low HCO₃⁻ fit?

03
Choose one
1 point

An ABG shows pH 7.48, PaCO₂ 42 mm Hg, and HCO₃⁻ 31 mEq/L. Which primary pattern fits the pH and the component directions?

  1. A

    Respiratory-acidosis pattern

  2. B

    Respiratory-alkalosis pattern

  3. C

    Metabolic-alkalosis pattern

  4. D

    Metabolic-acidosis pattern

04
True or false
1 point

True or false: A pH within the typical reference interval, by itself, rules out an acid–base disturbance.

  1. A

    True

  2. B

    False

05
Choose one
1 point

Which ABG component reflects the respiratory part of acid–base status?

  1. A

    PaCO₂

  2. B

    HCO₃⁻

  3. C

    PaO₂

  4. D

    SaO₂

06
Written response
1 point

Using the typical adult reference interval of 7.35–7.45, how should a pH of 7.44 be classified?

07
True or false
1 point

True or false: Typical ABG reference ranges may vary somewhat by laboratory, so interpretation should take the clinical context into account.

  1. A

    True

  2. B

    False

08
Choose all
1 point

Which measurements assess oxygenation rather than determining whether the primary acid–base pattern is respiratory or metabolic? Select all correct choices.

  1. A

    pH

  2. B

    PaO₂

  3. C

    PaCO₂

  4. D

    SaO₂

  5. E

    HCO₃⁻

09
Choose all
1 point

Which statements describe appropriate steps in a systematic ABG interpretation? Select all correct choices.

  1. A

    Check the pH first.

  2. B

    Compare PaCO₂ and HCO₃⁻ with their reference ranges and identify which direction fits the pH change.

  3. C

    Use PaO₂ and SaO₂ to decide whether the primary pattern is respiratory or metabolic.

  4. D

    Assess oxygenation separately, considering inspired oxygen and clinical context.

  5. E

    If the pH is in range, conclude that no acid–base disturbance is present.

10
Choose one
1 point

An ABG shows pH 7.40, PaCO₂ 50 mm Hg, and HCO₃⁻ 30 mEq/L. Which conclusion is best supported by the information given?

  1. A

    The ABG proves there is no acid–base disturbance because the pH is in range.

  2. B

    The elevated PaCO₂ alone establishes a respiratory-acidosis pattern despite the in-range pH.

  3. C

    The elevated HCO₃⁻ alone establishes a metabolic-alkalosis pattern despite the in-range pH.

  4. D

    The pH is in range, but that alone does not rule out a disturbance; interpret the components and clinical context further.

11
Open ended
1 point

Interpret this ABG using typical adult reference ranges: pH 7.28, PaCO₂ 30 mm Hg, HCO₃⁻ 14 mEq/L, and PaO₂ 72 mm Hg. State the pH finding, the primary acid–base pattern indicated by the components, and what the PaO₂ suggests.

12
Choose one
1 point

Which statement correctly distinguishes the roles of PaCO₂ and HCO₃⁻ in ABG interpretation?

  1. A

    PaO₂ reflects the metabolic component, while HCO₃⁻ measures oxygenation.

  2. B

    PaCO₂ reflects the respiratory component, while HCO₃⁻ reflects the metabolic component.

  3. C

    SaO₂ determines whether the primary acid–base pattern is respiratory or metabolic.

  4. D

    pH indicates oxygenation, while PaCO₂ indicates the percentage of hemoglobin saturated with oxygen.

13
True or false
1 point

Typical adult ABG reference ranges may vary somewhat by laboratory and should be considered alongside clinical context.

  1. A

    True

  2. B

    False

14
Choose one
1 point

An ABG shows pH 7.28, PaCO₂ 30 mm Hg, and HCO₃⁻ 14 mEq/L. Which interpretation best matches the pH and the component whose direction fits it?

  1. A

    Alkalemia with a respiratory-alkalosis pattern

  2. B

    Acidemia with a respiratory-acidosis pattern

  3. C

    Acidemia with a metabolic-acidosis pattern

  4. D

    A pH within range with a metabolic-alkalosis pattern

15
Written response
1 point

An ABG shows pH 7.51, PaCO₂ 29 mm Hg, and HCO₃⁻ 23 mEq/L. Which primary acid–base pattern is indicated by the pH and the component that matches its direction?

16
Choose one
1 point

An ABG shows pH 7.29, PaCO₂ 55 mm Hg, and HCO₃⁻ 25 mEq/L. Which interpretation best matches the pH and the component whose direction fits it?

  1. A

    Acidemia with a respiratory-acidosis pattern

  2. B

    Acidemia with a metabolic-acidosis pattern

  3. C

    Alkalemia with a respiratory-alkalosis pattern

  4. D

    A pH within range with a respiratory-acidosis pattern

17
Written response
1 point

An ABG shows pH 7.48, PaCO₂ 42 mm Hg, and HCO₃⁻ 31 mEq/L. Which primary acid–base pattern is indicated by the pH and the component that matches its direction?

18
Choose one
1 point

After identifying whether an ABG pH is below, above, or within the typical range, what is the next step in the stated interpretation sequence?

  1. A

    Assess PaO₂ and SaO₂ first to determine whether the primary pattern is metabolic or respiratory.

  2. B

    Compare PaCO₂ and HCO₃⁻ with their reference ranges.

  3. C

    Use PaCO₂ alone to determine both acid–base status and oxygenation.

  4. D

    Assume the acid–base values are normal if pH is not below 7.35.

19
Fill in the blank
1 point

An initial review of an ABG has identified a primary acid–base pattern. To complete the clinical interpretation, the clinician may also need to assess .

20
Fill in the blank
1 point

A clinician has identified the primary acid–base pattern in an ABG but is not yet ready to give a full clinical interpretation. One possibility that may still require assessment is a .