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Cartridge Chemistry: Calibration Theory
Endpoint and First-Order Calibration Formulas
UniCel DxC Systems Instructions For Use A13914
System Description
October 2005
Page 2-39
2
Endpoint and First-Order Calibration Formulas
The calibration factor is determined by using one of the following equation sets where
reaction and blank are used from the usable replicates.
Table 2.12
Calculation of Calibration Factors for Endpoint and Rate
Chemistries
Type
Formula
Nonblanked
Endpoint
Chemistries
FOR HIGH CALIBRATOR LEVEL:
Reaction ABS = ABS
rep1
Reaction ABS = ABS
rep2
(ABS
rep1
+ ABS
rep2
) × 0.5 = ABS
avg
(hi)
FOR LOW CALIBRATOR LEVEL:
Reaction ABS = ABS
rep1
Reaction ABS = ABS
rep2
(ABS
rep1
+ ABS
rep2
) × 0.5 = ABS
avg
(lo)
Offset = Cal Set Point (hi) - [Cal Factor × ABS
avg
(hi)]
Sample values are calculated by the following equation:
(Reaction ABS × Cal Factor) + offset = sample value
NOTICE
For single point linear calibration, the low calibrator is a fixed zero
point and the offset is equal to zero.
(1 of 6)
E014416L.EPS
Cal Factor (Slope) =
ABS
avg
(hi) – ABS
avg
(lo)
Cal Set Point (hi) – Cal Set Point (lo)