7.2 - Methods of Blood Gas Analysis
oxygen from the sample
Hydrogen gas within a pO2 electrode will combine with ______ and form water.
low
In an arterial specimen which is exposed to air, pCO2 will be falsely:
high
In an arterial specimen which is exposed to air, pH will be falsely:
high
In an arterial specimen which is exposed to air, pO2 will be falsely:
inversely proportional
Boyle's Law states that a volume of gas is ________ to the pressure applied to it.
barometric pressure changes
Cheap or old analyzers may need to be recalibrated if:
raising pH
Clotting causes issues with blood gas analysis by:
the sum of all partial pressures
Dalton's Law states that the total pressure of a gas mix is equal to:
cal, slope
Each sensor in the blood gas analyzer requires two calibrators:
anaerobically
For accurate results, collection, processing, and analysis of arterial specimens must be done:
gaseous
pCO2 electrodes only detect this form of CO2:
addition of acid to specimen
pCO2 electrodes work similarly to the ISE electrodes in normal chemistry instruments, but lack this step:
drop in resistance
pO2 electrodes measure the amount of oxygen as a function of:
protein build up
Analyzers may produce inconsistant or slow results due to _______ in sample chambers or on electrodes.
humidified
Before calibrator gases can be used, they must be:
capillary blood
Blood gas analysis on infants is most often performed on:
electrodes
Blood gas analyzers use _____ to detect pH, pO2, and pCO2.
anaerobic
Plastic vacutainers are not idea for blood gas analysis because they are not:
47 mmHg
The "standard" partial pressure of water vapor after humidification of calibrator gases is:
calomel, potassium salt bridge
The cathode of a pH electrode is used as a standard and is made from _____ with a ______.
hydrogen gas
The cathode of a pO2 electrode produces:
sodium silicate
The glass of a pH electrode is made from:
plastic syringe
The most common container for ABG specimens is:
glass syringe
The most ideal container for ABG specimens is:
oxygen permeable rubber
The outer covering of a pO2 electrode is:
HCl
The pH electrode in a blood gas analyzer is a sealed anode which contains:
percentages of each gas, barometric pressure
The partial pressures of calibrator gases must be determined before it can be used, and the following information is required:
heparinized arterial whole blood
The preferred specimen for blood gas analysis is:
increases
The production of hydrogen gas within a pO2 electrode ______ resistance.
decreases
The production of water within a pO2 electrode ______ resistance.
barometric pressure - 47
The sum of the partial pressures of CO2, O2, and N2 of a calibrator gas is:
slope
This calibrator is used for the high end of the linear range:
cal
This calibrator is used for the low end of the linear range:
37, 0.1
To be accurate, arterial blood gas samples must be analyzed at ____°C within ∓___°C.
