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This is a 15 MCQ quiz on acid base balance and blood gas sample collection. We suggest reviewing the Arterial access, Specimen collection and Blood gas analysis pages before taking this quiz.
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Question 1 of 15
1. Question
Which one of the following equations is correct
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Question 2 of 15
2. Question
The normal [H+] in the blood at rest is approximately
Incorrect
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Question 3 of 15
3. Question
Which one of the following statements regarding the venous bicarbonate concentration is not correct
Correct
The venous HCO3 is higher in venous blood than arterial blood due to the chloride shift into the red blood cell with exchange of HCO3. This occurs due to the buffering of H+ ions by deoxyhaemoglobin in the RBC which also contains carbonic anhydrase. (link)
Incorrect
The venous HCO3 is higher in venous blood than arterial blood due to the chloride shift into the red blood cell with exchange of HCO3. This occurs due to the buffering of H+ ions by deoxyhaemoglobin in the RBC which also contains carbonic anhydrase. (link)
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Question 4 of 15
4. Question
Which of the following statements best defines base excess
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Question 5 of 15
5. Question
Which of the following statements regarding the standard base excess is most correct
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Question 6 of 15
6. Question
Which of the following statements regarding blood gases is not correct
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Question 7 of 15
7. Question
Which one of the following statements regarding the Allen’s test is incorrect
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Question 8 of 15
8. Question
The optimal size of needle to obtain a single radial artery blood gas sample in a well perfused adult is
Correct
A 25G cannula is the most appropriate choice for most patients who are well perfused. Whilst flow may be reduced compared to a larger needle, it is less painful and traumatic. (link)
Incorrect
A 25G cannula is the most appropriate choice for most patients who are well perfused. Whilst flow may be reduced compared to a larger needle, it is less painful and traumatic. (link)
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Question 9 of 15
9. Question
Which of the following statements regarding arterial blood gas sampling is not correct
Correct
A stopper should be applied to the end of the syringe after expelling any trapped air. Suction to the syringe may alter the partial pressure of O2.(link)
Incorrect
A stopper should be applied to the end of the syringe after expelling any trapped air. Suction to the syringe may alter the partial pressure of O2.(link)
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Question 10 of 15
10. Question
The minimum possible amount of blood for blood gas sampling is usually
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Question 11 of 15
11. Question
Following blood gas sampling, what duration of pressure should be applied to the artery in patients with normal coagulation
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Question 12 of 15
12. Question
Following blood gas sampling, what duration of pressure should be applied to the artery in patients who are anticoagulated
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Question 13 of 15
13. Question
Which of the following is the maximum time that an arterial blood gas sample can be left at room temperature without refrigeration without significantly altering the results of the analysis
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Question 14 of 15
14. Question
To obtain a sample through an arterial line requires a withdrawal and discard volume of at least
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Question 15 of 15
15. Question
The deadspace of a 20G arterial catheter and pressure transducer is approximately
Correct
The deadspace is approximately 1.2mL therefore withdrawing 5mL and discarding prior to obtaining a blood gas sample is more than the 3 time the deadspace volume required (link)
Incorrect
The deadspace is approximately 1.2mL therefore withdrawing 5mL and discarding prior to obtaining a blood gas sample is more than the 3 time the deadspace volume required (link)