7.2 - Methods of Blood Gas Analysis

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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.


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