Clinical Laboratory Chemistry: Chapter 13, Blood Gases Flashcards


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1

What are the 4 major body buffer systems?

Hgb, phosphates, proteins, and bicarbonate

2

5 ways in which CO2 is carried in the blood:

Bicarbonate
Carbonate
________ acid
Dissolved CO2
Carbamino compounds

Carbonic

3

Preanalytical sources of errors in blood gas analysis include:

Air in syringe, _______, speciment not well mixed, and test delays

Clots

4

What is the speciman of choice, syringe choice and area of draw for blood gas analysis?

Whole blood
Heparin syringe
Arterial(radial) preferred

5

Increased amount of carbon dioxide in blood is __________.

Hypercapnia

6

What is the most IMPORTANT extracellular buffer system?

Biocarbonate/carbonic acid system

7

What is the LARGEST buffer in the body?

Hemoglobin buffer

8

After ABG draw, specimen should be placed in an ice slurry and should be read within _________ from draw

15 minutes

9

Specimens exposured to any air will cause _________ in pO2 and a ________ in pCO2, also an ___________ in pH

increase pO2
decrease pCO2
increase pH

10

Speciman in a higher temp. glycolysis contributes to an _____pH and ___ pCO2.

decrease pH
increase pCO2

11

At 7.4 the normal biocarbonate:carbonic acid ratio is

20:1

12

Normal pH range

7.35-7.45

13

Normal HCO3- range

22-26

14

Normal pCO2 range

35-45

15

pO2 normal range is

80-100

16

Arterial blood collected in a syringe but exposed to room air by introduction of an air bubble would cause __________ PO2____________PCO2 _______pH.

elevated PO2
decreased PCO2
elevated pH

17

Use the following artirial blood gas results

pH= 7.24
pCO2= 55 mm Hg
HCO3= 23 mEq/L

What is the likely diagnosis of the patient?

Respiratory acidosis

18

Specimens for blood gas determination should be drawn into a syringe containing __________.

Heparin

19

Toxic effects of carbon monoxide are caused by displacement of oxygen _______

Heme

20

Toxic effects of carbon monoxide would cause a __________ shift of the oxygen curve

Left

21

What is the primary carrier of carbon dioxide?

Bicarbonate

22

Metabolic acidosis has a __________pH __________ HCO3 _____________PCO2

decrease pH,
decrease HCO3,
normal PCO2

23

Respiratory Alkalosis has a __________pH, _______HCO3, __________PCO2

increase pH,
normal HCO3,
decrease PCO2

24

Blood pH above 7.45 is called

Alkalosis

25

Blood pH below 7.35 is called

Acidosis

26

What is it called when the body tries to correct the problem by using the system that isn't causing the problem?

Compensation

27

Compenstated respiratory acidosis shows a __________ pH, _________HCO3, __________PCO2

decrease of pH,
increased HCO3,
increase in PCO2

28

Increased amount of Carbon Dioxide in the blood

Hypercapnia

29

The form that CO2 is carried in the blood

Carbamino

30

Pressure exerted by gas, whether alone or mixed with other gases

Partial