Author Question: Which blood gas analyzer electrode uses a separate reference electrode? a. O2 b. pH c. Clark ... (Read 65 times)

Cooldude101 · **on:** Jul 16, 2018

Which blood gas analyzer electrode uses a separate reference electrode?

a. O2
b. pH
c. Clark
d. HCO3

Question 2

What media are used to calibrate a blood gas analyzer's gas electrodes?

a. Standard pH buffer solutions
b. Bloodlike control media
c. Precision mixtures of O2 and CO2
d. Tonometered human blood samples

FergA · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
The reference half-cell produces a constant potential, regardless of sample pH. The difference in potential between the two electrodes is proportional to the H+ concentration of the sample, which is displayed on a voltmeter calibrated in pH units.

Answer to Question 2

ANS: C
In most units, the media used to calibrate the gas electrodes are precision mixtures of oxygen and carbon dioxide.