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4Ć118
800 Series Operator's Manual
Problem Probable Cause and Solutions
Insufficient Sample There is not enough sample to fill the measurement block. You
can manually position the sample for measurement. See
Analyzing Microsamples, Steps 5-11, in Section 2.
1. Ensure that the sample volume is sufficient for the
sampling device used and the tests requested.
2. Check sample entry components for leaks or obstructions.
See Removing Obstructions from Sample Entry
Components in Section 4.
3. Replace the sample tubing.
4. Verify that the sample pump is operating correctly and test
the flow rate of sample pump, as described in the Pump
Functions Test in Section 4.
Interfering
Substance: Glu
Interfering
Substance: Lac
The system detects substances in the sample that may interfere
with glucose or lactate measurement. # is printed next to the
glucose or lactate result on reports.
1. Check the sample source and determine whether the
presence of an interfering substance is likely. See
Appendix E, Performance Characteristics, for a list of
interfering substances.
2. If the message appears on multiple patient samples that do
not contain interfering substances, replace the appropriate
biosensor, as described in Replacing the Glucose and
Lactate Biosensors in Section 3.
Interfering
Substance: tHb
The CO-ox module detects substances in the sample that may
interfere with CO-ox measurement. The system tries to correct
the measurement to account for the substance.
1. Check the sample source and determine whether the
presence of an interfering substance is likely. See
Appendix E, Performance Characteristics, for a list of
interfering substances.
2. If the message appears on multiple patient samples that do
not contain interfering substances, clean the bubble trap
and sample chamber, as described in Cleaning the Sample
Chamber in Section 3.
(Continued)