User's Manual

i15 Blood Gas and Chemistry Analysis System User Manual Parameters
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In the comparison study, samples were analyzed in parallel on the i15 Blood Gas and Chemistry
Analysis System and the Rapidpoint 400 system. Two replicates of each sample were analyzed
on each system.
Parameter N Slope Intercept
Correlation
Coefficient
Sy.x Range
Cl
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215 0.9955 0.2967 0.9961 0.9802 77 - 132
12.7.4 Interfering Substances
Aqueous sample was spiked by addition of a potentially interfering substance to the following
test concentration to test for interferences. Twelve replicates of both the spiked sample and the
unspiked sample were tested on two i15 Blood Gas and Chemistry Analysis Systems with one lot
of test cartridges. The interference was computed using the difference between the mean of the
spiked sample and the unspiked sample.
The substances interfering with the Cl
-
measurement are listed below:
 12.5mmol/L bromide will increase Cl
-
results by 15.5mmol/L.
 4.00mmol/L salicyte will increase Cl
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results by 15.0mmol/L.
The following substances were tested and found not to be clinically significant for the Cl
-
measurement: 24mmol/L hydroxyurea, 1.0mmol/L magnesium, 20mmol/L lactate, and 20mmol/L
β-hydroxybutyrate.
NOTE:
It is possible that there are other substances interfering with the Cl
-
measurement.
12.8 Hematocrit (Hct)
Hematocrit is a measurement of the volume occupied by red blood cells in whole blood samples.
Hematocrit is determined by conductometry with two gold electrodes. The conductance of the
blood sample is inversely related to the hematocrit value.
If test results are inconsistent with the clinical assessment, the sample should be analyzed again
with a new test cartridge.