Roche Diagnostics
A-30 Operator’s Manual · Version 3.1
2 Introduction to the instrument Cedex Bio System
Daily operation
o Interval QC
This method applies to tests whose controls have an interval defined.
Interval QC is a process that is suitable both for performing a single QC
measurement and for performing all QC measurements that are due. You can
select all tests that require QC simply by pressing a button. (This selection also
reflects QC of the type QC After Cal.) A wizard helps you select the controls, and
a placement list supports you in preparing and loading them.
Validating QC results Each new QC result has to be validated. If flags were generated, you must determine
their cause and decide whether to accept or ignore the result.
You can automatically accept unflagged results and results with flags that are
contained in a specific list of flags that should be ignored.
e
See Editing the acceptable flags list on page B-160.
If you ignore a QC result you exclude the result from further QC result calculations
such as QC History statistics.
Sample handling
You can place up to eight sample tubes on the sample area.
Sample types The Cedex Bio instrument can process aqueous samples from mammalian and
bacterial cell cultures and fermentation.
A Sample area LED. A green LED indicates that you should place a tube, a blinking yellow LED
that you should keep clear of the sample area.
Figure A-6 Sample area with sample tubes
Incorrect results due to inadequate sample preparation
Specimen containing clots may obstruct the probe. Specimen containing bubbles or foam
may cause level detection errors and air pipetting. Consequently, incorrect results may be
generated.
Take adequate care when preparing the samples.
Incorrect results due to insufficient fluid
Insufficient fluid may lead to inaccurate pipetting and consequently to incorrect results.
Always fill the tubes with enough fluid that at least the defined dead volume of fluid is left
when pipetting is complete.
e
See Tubes on page A-53.
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