5
1. Understanding the EasyStat Analyzer
Intended Use
The EasyStat analyzer is designed for clinical laboratory use, mak-
ing direct measurements of pH (hydrogen ion activity), PCO
2
(partial
pressure of carbon dioxide), PO
2
(partial pressure of oxygen), Hct
(Hematocrit), Na
+
(sodium), K
+
(potassium), and Ca
++
(ionized
Calcium) or Cl
-
(chloride) on whole blood samples from syringes or
capillary tubes.
Ca
++
(ionized calcium) and Cl
-
(chloride) electrodes are interchange-
able on the analyzer. The EasyStat can only measure Ca
++
(ionized
calcium) or Cl
-
(chloride) at one time. After switching to the EasyStat
(Chloride) mode, the new Cl
-
electrode will occupy the same position
as the Ca
++
electrode.
This analyzer is used by laboratory trained technicians in clinical
laboratories to aid in the diagnosis and treatment of patients with
electrolyte, blood gas and/or acid-base disturbances. The patient
results obtained from the EasyStat analyzer must be used in conjunc-
tion with the overall patient clinical condition before corrective/thera-
peutic action is taken.
The EasyStat analyzer also calculates the following parameters, based
on the equations outlined under Calculations in Principles of
Operation/Theory.
•
Total Hemoglobin: THb
• Temperature corrected pH: pH(T)
•
Temperature corrected PCO
2
: PCO
2
(T)
•
Temperature corrected PO
2
: PO
2
(T)
•
Total Carbon Dioxide: TCO
2
•
Bicarbonate: HCO
3
-
•
Base Excess of blood: BE
b
•
Base Excess in extracellular fluid: BE
ecf
•
Standard Bicarbonate: SBC
•
Oxygen Saturation calculated at normal P
50
: %SO
2
c
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