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Non-Linear and Multipoint Calibrations
Overview
Troubleshooting Calibration and Result Errors
UniCel DxC Systems Instructions For Use A13914
Page 13-12
October 2005
Non-Linear and Multipoint Calibrations
Overview
Non-linear chemistries include drugs and specific protein assays. The calibration
curves for non-linear calibrations are logarithmic or have other non-linear
relationships.
Non-linear chemistry calibrations may have single level or multilevel calibrators.
• Multipoint calibrations are based on a single determination of each calibrator level
(five or six levels). The standard curve is determined by use of one of several non-
linear math models.
• Single point non-linear calibrations are based on one or two levels of calibrators.
These chemistries set calibration based on two to four replicates of each calibrator
level.
Failed Multipoint calibration errors will be noted with an (*) at the bottom of the
calibration report.
Refer to CHAPTER 2, System Description, "
" for additional information on this subject.
Non-Linear Calibration Checks
Non-linear calibrations have a set of calibration checks specific to non-linear
calibrations.
• The first check determines whether the data is reasonable to attempt the curve
fitting.
• The second check determines whether the Multipoint span is within acceptable
limits.
The next set of errors are inherent to non-linear curve fitting and may or may not cause
calibration failure. Under certain conditions the curve fitting will produce parameters
and curves that may contain mathematical errors. Typically these errors occur outside
of the reagent dynamic range and have no effect on sample recovery. Math errors may
be either overrideable or non-overrideable depending on the severity of the failure.
Math errors are reported as "MATH ERROR #" with the number associated with a
specific error that has occurred.
Multipoint Span
• The Multipoint Span flag is a measure of sensitivity over the entire standard curve.
• This is the difference between consecutive calibrator rates or absorbencies. There
can be up to six Multipoint spans for Level 0–1, 1–2, 2–3, 3–4, 4–5, 5–0.