3.7.1 Arterial Blood Gas Analysis

Question 1

Specimen for ABGA?

Answer 1

Arterial blood

Question 2

Arterial blood collected WITH tourniquet in ________ sterile glass syringe

T or F

a. 3 to 5 mL
b. 1 to 3 mL
c. 2 to 4 mL

Answer 2

F (Without)

b

Question 3

Preferred site for Arterial blood collection?

Answer 3

Radial

then Brachial, Femoral

Question 4

Anticoagulant for ABG?

Answer 4

Lyophilized heparin (0.05mL heparin / mL of blood)

Question 5

ABG requires ANAEROBIC collection that is kept on ICE to RETARD WBC metabolism

T or F

Answer 5

T

Question 6

ABG should be assayed within

a. 10 mins
b. 15 mins
c. 20 mins

Answer 6

b

Question 7

Blood gas instrumentations:

The following uses an electrode except:

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 7

d - Uses CO-oximeter

Question 8

Blood gas instrumentations:

Principle: Potentiometry

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 8

a and b

Question 9

Blood gas instrumentations:

Principle: Amperometry

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 9

c

Question 10

Blood gas instrumentations:

Principle: Spectrophotometric measurement

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 10

d

Question 11

Blood gas instrumentations:

Calibration:

2 phosphate buffers of known pH stored anaerobically at room temperature

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 11

a

Question 12

Blood gas instrumentations:

Calibration:

2 gases of known pO2

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 12

c

Question 13

Blood gas instrumentations:

Calibration:

Specimen 0% with 100% of _____

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 13

d

Question 14

Blood gas instrumentations:

Calibration:

2 known gases of pCO2

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 14

b

Question 15

Reference Range and Panic values:

Ref Range:

7.35-7.45

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 15

a

Question 16

Reference Range and Panic values:

Ref Range:

> 95%

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 16

d

Question 17

Reference Range and Panic values:

Ref Range:

35-45 mmHg

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 17

b

Question 18

Reference Range and Panic values:

Ref Range:

80-110 mmHg

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 18

c

Question 19

Reference Range and Panic values:

Panic Values:

≤ 7.2, ≥ 7.6

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 19

a

Question 20

Reference Range and Panic values:

Panic Values:

<40 mmHg

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 20

c

Question 21

Reference Range and Panic values:

Panic Values:

≤20, ≥60 mmHg

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 21

b

Question 22

Reference Range and Panic values:

Panic Values:

N/A

a. pH
b. pCO2
c. pO2
d. SaO2

Answer 22

d

Question 23

Reference Range and Panic values:

Ref Range:

(-2) - (+2)

a. HCO3
b. Total CO2
c. BE

Answer 23

c

Question 24

Reference Range and Panic values:

Ref Range:

22-26 mmol/L

a. HCO3
b. Total CO2
c. BE

Answer 24

a

Question 25

Reference Range and Panic values:

Ref Range:

23-27 mmol/L

a. HCO3
b. Total CO2
c. BE

Answer 25

b

Question 26

Reference Range and Panic values:

Panic Values:

≤10, ≥40 mmol/L

a. HCO3
b. Total CO2
c. BE

Answer 26

a

Question 27

Reference Range and Panic values:

Panic Values:

N/A

a. HCO3
b. Total CO2
c. BE

Answer 27

b and C

Question 28

Factors that affect ABG values

In Oxyhemoglobin Dissociation Curve:

Causes of shift to the right includes:
- _______ pCO2
- ______ pH (Acid or Alkaline)
- Increase 2,3 DPG
- Exercise (Excessive
- ______ temp

Answer 28

Increase

Acid

Increase

(Mnemonics: CADET)

Question 29

Factors that affect ABG values

In temperature

Electrode chambers of blood gas analyzers are thermostatically
controlled at ________°C

a. 37 ± 0.4
b. 37 ± 0.2
c. 37 ± 0.1
d. 37 ± 0.3

Answer 29

c

Question 30

Factors that affect ABG values

In temperature

Every 1°C increase in body temperature causes:

pCO2 __________ by 3%
pO2 decreases by ___
pH _________ by 0.015 unit

These are consistent with CADET

Answer 30

Increases

7%

Decreases

Question 31

Factors that affect ABG values

Specimen exposure to air:

AVOID formation of bubbles since atmospheric air contains ________ O2 level and _______ CO2 level

This is the opposite of CADET

Answer 31

Increase

Decrease

Question 32

Factors that affect ABG values

Prolonged Storage of Specimen:

Stand for more than _____ mins will undergo metabolism which produces _______ that LOWERS the pH

Answer 32

30

Lactate

Question 33

Factors that affect ABG values

Prolonged Storage of Specimen:

Since the cells continue to metabolize, oxygen will _________, and CO2 will be released as a byproduct of metabolism

Answer 33

be depleted (Decrease)

Question 34

Factors that affect ABG values

Excess anticoagulant:

Increase DRY heparin: ____ pH
Increase LIQUID heparin: ____ pCO2

Answer 34

Both decrease

Question 35

Factors that affect ABG values

Excess anticoagulant:

Heparin is an acidic polysaccharide

T or F

Answer 35

T

Question 36

↓ pCO2, ↑ pO2, ↓ pH

a. Specimen exposure to air
b. Prolonged storage of specimen

Answer 36

a

Question 37

↑ pCO2, ↓ pO2, ↓ pH

a. Specimen exposure to air
b. Prolonged storage of specimen

Answer 37

b