Blood Gas Analysis Common Source of Error

Question 1

What increases with sample sitting at RT for more than 30 min?

Answer 1

Increased pCO2, decreased pH and PO2. Effect: Acidosis

Question 2

What increases with bubbles in syringe, uncapped specimen?

Answer 2

Decreased pCO2, increased pH and PO2. Effect: Alkalosis

Question 3

What happens with hyperventilation

Answer 3

Decreased pCO2, increased pH and PO2. Effect: Alkalosis

Question 4

What happens when specimen is exposed to air?

Answer 4

Decreased pCO2, increased pH and PO2. Effect: Alkalosis

Question 5

Critical Value of Acidosis

Answer 5

7.20 pH

Question 6

Critical panic values of ABG are?

Answer 6

HCO3 and PCO2

Question 7

Too much heparin in collection increases?

Answer 7

PCO2

Question 8

Failure to transport specimen to 4C increases and decreases?

Answer 8

Increases CO2
Decreases O2

Question 9

Determine acid base status:

Decreased pH
Normal PCO2
Decreased HCO3

Answer 9

Uncorrected Metabolic Acidosis

Question 10

Respiratory Acidosis and Alkalosis important factors

Answer 10

pH and pCO2. H2CO3 usually only increases with pCO2. Inverse relationship: pH and pCO2

Question 11

Metabolic Acidosis and Alkalosis important factors

Answer 11

Directly proportional relationship between pH and HCO3

Question 12

Henderson-Hasselbach Equation

Answer 12

pH = 6.1 + log(HCO3/PCO2 x 0.03)

HCO3 = TCO2 - (PCO2 x 0.03)

Question 13

pH decreases by what for each degree celcius above 37C

Answer 13

0.015

Question 14

Hyperventilation is a primary compensatory mechanism of?

Answer 14

Metabolic acidosis

Question 15

Hypoventilation is a primary compensatory mechanism of?

Answer 15

Metabolic alkalosis

Question 16

Determine the imbalance in: Diabetic ketoacidosis and prolonged diarrhea

Answer 16

Metabolic acidosis hyperventilation as compensatory mechanism

Question 17

Determine the imbalance in: Starvation and Lactic Acidosis

Answer 17

Metabolic acidosis hyperventilation as compensatory mechanism

Question 18

Determine the imbalance in: Vomiting and use of antacids

Answer 18

Metabolic alkalosis

Question 19

Compensatory mechanism of respiratory acidosis

Answer 19

Kidneys retain bicarbonate, excrete hydrogen

Question 20

Imbalance in pneumonia and emphysema

Answer 20

Respiratory Acidosis

Question 21

Imbalance in early salicylate poisoning and high fever

Answer 21

Respiratory alkalosis

Question 22

Compensatory mechanism of respiratory alkalosis

Answer 22

Excrete bicarbonate, retain hydrogen

Bicarbonate is basic –> when you excrete this, you lower alkaline levels