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Diagnostic Products Corporation From Berlin to Baltimore: Imprecision as a  Continuous Function  of Concentration A. Paul Durham Dir. Scientific Publications
IAEA Symposium, Berlin 1977 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],*Sadler. Comput Methods Programs Biomed 2002;67:195.
Nested, Bowl-Shaped Precision Contours Redrawn from: Munson, Rodbard. IAEA 1977: Radioimmunoassay, v.2,  pp.109, 111. Precision types? . . . or components? Working Range: How much do we see?
One-Way ANOVA: The Very Idea Redrawn from poster. Clin Chem 1986;32:1180. Suggests various “nonparametric” alternatives. . . .
Sources of Variation (“Trouble-makers”) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Some Observable Precision Types: PO*Set *PARTIALLY ORDERED by associated “Troublemakers” Note: Kit lot variations are not smoothly represented in most PT events.
Ep5~2005 Fuentes-Arderiu, et al. eJIFCC 2003 Mar;14(1). Fig 1a. [pdf]
Redrawn (SD inset) from: Fuentes-Arderiu, et al. eJIFCC 2003 Mar;14(1). Ep5~2005
Ep5~2005
Ep5~2005 Reportable Range (JJE) 3 – 1000 U/L
Ep5~2005
Ep5~2005 Reportable Range (JJE) 20 – 625 mg/dL
The Shrinking Range
Index Plots, 8 Samples Precision Profile
 
 
 
After Before
Response-Error Relationship: 2P or 3P* Ep5~2005 *Daniels. Clin Chem 1994;40:513.
Ep5~2005
Ep5~2005
Ep5~2005 Typical IA / IMA Calibration Curve: 4P
Translate SD(Response) to SD(Dose)
Indirect 6P (or 7P) Method requires at least 7 (or 8) well-spaced samples.
 
 
X=TSH, mIU/L — Y=CV% Graphs from: Rawlins, Roberts. Clin Chem 2004;50(S6):A95. Six Automated Third Generation TSH Assays 3 Weeks, 2 Days/Week, 2 Reps/Day — for 2 Kit Lots (Total: 24 Reps)
Data from: Rawlins, Roberts. Clin Chem 2004;50(S6):A95. Ep5~2005
Sadler’s 3-Parameter Variance Function Redrawn from: Sadler. Variance Function Program [PDF]. Christchurch, May 2001.
Monique De Rae, De  Blauw ogige Lady www.mderae.be
Ep5~2005
Ep5~2005
Ep5~2005
Andree et al. Clin Chem 2004;50(S6):A100.
Andree et al. Clin Chem 2004;50(S6):A100.
Andree et al. Clin Chem 2004;50(S6):A100.
Andree et al. Clin Chem 2004;50(S6):A100.
Diagnostic Products Corporation www.DPCweb.com    technical documents [email_address] F316a Clinical and Laboratory Standards Institute — EP5 — Baltimore, 2005

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