Blood Gas Analysis Common Source of Error Flashcards
What increases with sample sitting at RT for more than 30 min?
Increased pCO2, decreased pH and PO2. Effect: Acidosis
What increases with bubbles in syringe, uncapped specimen?
Decreased pCO2, increased pH and PO2. Effect: Alkalosis
What happens with hyperventilation
Decreased pCO2, increased pH and PO2. Effect: Alkalosis
What happens when specimen is exposed to air?
Decreased pCO2, increased pH and PO2. Effect: Alkalosis
Critical Value of Acidosis
7.20 pH
Critical panic values of ABG are?
HCO3 and PCO2
Too much heparin in collection increases?
PCO2
Failure to transport specimen to 4C increases and decreases?
Increases CO2
Decreases O2
Determine acid base status:
Decreased pH
Normal PCO2
Decreased HCO3
Uncorrected Metabolic Acidosis
Respiratory Acidosis and Alkalosis important factors
pH and pCO2. H2CO3 usually only increases with pCO2. Inverse relationship: pH and pCO2
Metabolic Acidosis and Alkalosis important factors
Directly proportional relationship between pH and HCO3
Henderson-Hasselbach Equation
pH = 6.1 + log(HCO3/PCO2 x 0.03)
HCO3 = TCO2 - (PCO2 x 0.03)
pH decreases by what for each degree celcius above 37C
0.015
Hyperventilation is a primary compensatory mechanism of?
Metabolic acidosis
Hypoventilation is a primary compensatory mechanism of?
Metabolic alkalosis
Determine the imbalance in: Diabetic ketoacidosis and prolonged diarrhea
Metabolic acidosis hyperventilation as compensatory mechanism
Determine the imbalance in: Starvation and Lactic Acidosis
Metabolic acidosis hyperventilation as compensatory mechanism
Determine the imbalance in: Vomiting and use of antacids
Metabolic alkalosis
Compensatory mechanism of respiratory acidosis
Kidneys retain bicarbonate, excrete hydrogen
Imbalance in pneumonia and emphysema
Respiratory Acidosis
Imbalance in early salicylate poisoning and high fever
Respiratory alkalosis
Compensatory mechanism of respiratory alkalosis
Excrete bicarbonate, retain hydrogen
Bicarbonate is basic –> when you excrete this, you lower alkaline levels