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Linear Calibration
Overview
Troubleshooting Calibration and Result Errors
UniCel DxC Systems Instructions For Use A13914
Page 13-8
October 2005
Linear Calibration
Overview
For all linear photometric chemistries, the UniCel DxC sets calibration based on two
or four calibrator replicates.
• For calibrations using four replicates, the instrument will determine and discard the
highest and lowest values of the four replicates. The remaining two values are called
the usable calibrator replicates. Only the two usable replicates will be used for the
calibration calculations. The average value of the usable calibrator replicates is used
to determine the calibration factor.
• For calibrations using only two replicates, the instrument uses the average of both
replicates in determining the calibration factor.
Calibration fails if one or more of the usable replicates is flagged.
Linear calibration chemistries include Endpoint and First Order reactions. For
additional information about linear calibration or for specific calibration equations,
refer to CHAPTER 2, System Description, "
Endpoint and First-Order Chemistries
"
Endpoint and First-Order Calibration Formulas
Calibration flags that are specific to the linear photometric chemistries, causing the
reagent to fail its calibration, are back-to-back and Calibrator Range (High/Low)
errors, and for linear chemistries that use more than one calibrator, Span.
To view the calibration flag limits for all calibrated chemistries, access View
Calibrator Acceptance Limits in the Rgts/Cal screen. Calibration flags for any
chemistry with loaded calibration data are available to view and print.
Back-to-Back
• A back-to-back error check is a measure of system precision during calibration.
• A back-to-back value is the difference between the two usable replicate values. If
the back-to-back limit is exceeded the calibration fails.
• Limits are either pre programmed in the system chemistry database or downloaded
from disk before calibration.
Calibrator Range (High/Low)
• Calibrator Range (High/Low) error check is a measure of reagent performance or
accuracy.
• Calibrator ADC values are compared to acceptable ranges for calibrator values.
Calibration fails if the calibrator ADC values fall outside the acceptable calibrator
limits.