Blood gas analyzers measure pH, partial pressure of carbon dioxide (pCO2), and partial pressure of oxygen (pO2) in blood. Changes in these values can cause cardiac arrhythmias, ventricular hypotension, and death. The analyzers measure pH using a glass electrode, pCO2 using an electrode with a plastic cover and bicarbonate buffer, and pO2 using a platinum cathode, silver-silver chloride anode, and sodium chloride electrolyte. A complete blood gas analyzer can measure all three values from a single blood sample.

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Blood Gas Analyser
Prepared by,
Benaruth M
II BioMedical
Benaruth M Blood Gas Analyser 1

2. BLOOD GAS ANALYSER
Benaruth M Blood Gas Analyser 2

3. BLOOD GAS ANALYSER
Blood Gas Analysers are used to measure the
o pH
o Partial pressure of Carbon di oxide (pCO2)
oPartial pressure of oxygen (pO2)
A sudden change in these could result in
o Cardiac arrhythmia
oVentricular hypotension
oThis may also lead to death
Benaruth M Blood Gas Analyser 3

4.  The acidity and alkalinity
of solution depend on
concentration of hydrogen
ion.
 Measured using Glass
Electrode
BLOOD pH MEASUREMENT
Benaruth M Blood Gas Analyser 4

5. pH MEASUREMENT
Benaruth M Blood Gas Analyser 5

6. BLOOD pH Electrode
 Blood pH is measured using
glass electrodes of different
shape.
 The reference electrode used
is Ag/AgCl or Calomel
Electrode.
6Benaruth M Blood Gas Analyser

7. BLOOD PCO2
 Measured using electrode with
plastic cover.
 Electrode and cover has
Bicarbonate buffer in between
 The change in pH of the buffer
shows the amount of
Carbondioxide dissolved
Benaruth M Blood Gas Analyser 7

8. BLOOD PO2
 Cathode: Platinum
 Anode:Ag-AgCl
 Electrolye:NaCl
 Voltage:700mV
Benaruth M Blood Gas Analyser 8

9. COMPLETE BLOOD GAS
ANALYSER
Benaruth M Blood Gas Analyser 9

10. Benaruth M Blood Gas Analyser 10