OPTIMedical OPTI CCA-TS, Руководство оператора, Страница: 164 / 271

Operator’s Manual – OPTI CCA-TS 8-9
8 OPERATING PRINCIPLES
8.5.4 Calculated Values
Parameter Range Display Units
Resolution
Actual bicarbonate, HCO
3
-
1 to 200 0.1 mmol/L
Base excess, BE -40 to +40 0.1 mmol/L
Base excess ecf, BE
ecf
-40 to +40 0.1 mmol/L
Base excess actual, BE
act
-40 to +40 0.1 mmol/L
Buffer base, BB 0 to 100 0.1 mmol/L
Total CO
2
, tCO
2
1 to 200 0.1 mmol/L
Standard bicarbonate, st.HCO
3
-
1 to 200 0.1 mmol/L
Standard pH, st.pH 6.5 to 8.0 0.001 pH units
Oxygen saturation, S O
2
(c) 0 to 100 0.1 %
Oxygen content, O
2
ct 0 to 56 0.1 mL/dL
Hematocrit, Hct(c) 15 to 75 1 %
Hydrogen ion concentration, cH
+
10 to 1000 0.1 nmol/L
Alveolar-arterial oxygen difference 0 to 800 0.1 mmHg
AaDO
2
Anion Gap, AG 3 to 50 1 mmol/L
P
50
15 to 35 0.1 mmHg
nCa
++
0.1 to 3.0 0.1 mmol/L
8.5.5 Calibration
Each lot of OPTI cassettes is calibrated during the manufacturing process. The process utilizes high
precision standard solutions spanning the operating range for pH and ions. For O
2
, CO
2
, tHb and SO
2
the calibration parameters are determined using specially targeted calibration standards focusing on
the clinically critical ranges. Every cassette package has a bar code label containing this calibration
information as well as its lot number and expiration date.
Prior to running a sample, the cassette’s bar code is scanned into the analyzer by holding the cassette
package in front of a conveniently located bar code scanner. The cassette is then installed and a
calibration is performed using the precision buffer within the cassette and a precision gas mixture similar
to that used by conventional blood analyzers. In addition, an optical zero point calibration of all six
channels is performed.
During the calibration and measurement processes, diagnostic tests are automatically performed to assure
correct operation of the instrument and measurement of the cassette. These tests include automatic
checks of the cassette for packaging integrity, proper cassette temperature control, fluidic control during
calibration, proper equilibration behavior of the sensors during calibration and measurement, automatic
detection of bubbles and short sample during aspiration, and automatic detection of low gas or low
battery, dirty optics, or worn pump conditions.