Two Important Statistics
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1 Two Important Statistics 70% 40% 0 Quality Control & YOU David Plaut Fall, 2012 davidplaut@yahoo.com 1 11
2 Why do physicians order laboratory tests? 2 2 Why do Physicians Order Laboratory Tests? 1. Patients cannot always give an accurate history. 2. Signs (patient looks flushed) are not specific for a particular disease. 3. Symptoms ( It hurts! ) are not specific
3 Achieving Quality Results Quality Goals --> Quality Monitoring (QM) --> Quality Control (QC) 4 4 The Three Sources of Errors 1. Pre-analytical ~ 60 70% 2.Analytical ~ Post-analytical ~
4 Types of Errors The four types of analytical errors Gross Random Random Systematic Anyone would detect Inherent, background, normal Not normal; something s wrong Bias, shift, trend 6 6 Sources of Error? Bad instrument Bad reagents Bad control Bad calibration Bad sample
5 Types of Errors 1 Random Same patient sample run 10 times Why are the values not identical? 8 Types of Errors 1 Random A normal, bell, Gaussian, curve mean Frequency (-) (+) Value
6 The Gaussian Curve Probability or Frequency mean Areas under the curve % % % Optional: Click here to view animation Types of Errors 2 Increased Random Errors mean Frequency (-) (+) Value
7 Types of Errors 2 Increased Random Occur on both sides of the mean and can be of varying size Tend to be caused by changes in the instrument Types of Errors 3 The second type of analytical error: Systematic Tend to be on one side (same side) of the mean Tend to be caused by changes made by people changing reagents calibration doing something to the instrument
8 Types of Errors 3 Systematic analytical error (aka bias) Old mean The true mean is truly not known in analytical hematolgy For us it is either the package insert or the group mean. Let s agree that our mean is reasonably close to the true mean Types of Errors 2 The second type of analytical error: Systematic Tend to be on one side (same side) of the mean Tend to be caused by changes made by people changing reagents calibration doing something to the instrument
9 Types of Errors 2 Systematic analytical error (aka bias) True mean The true mean is truly not known in analytical hematology. For us it is either the package insert or the group mean. Let s agree that our mean is reasonably close to the true mean The Primary Goal of our QC Program To detect errors significant rapidly 17 91
10 To Detect the Two Kinds of Errors: Two Statistics The Mean The CV 18 HOW MANY DATA POINTS TO ESTABLISH A MEAN? Hgb Cumulative "Crit" Cumulative Data Mean CV Mean CV Mean SD CV %
11 Establishing YOUR SD From the historical data use the cumulative CV (CV c ) in the formula: SD(New) = CV c * mean (New) Westgard, J. et al. Clin Chem. 27: 493, Plaut, D. various publications Establishing YOUR CV CV= mean* SD
12 How are 3 CV% and SDI related? 3 r = How are 3 CV% and SDI related? Series
13 The Primary Goal of our QC Program To detect errors significant rapidly 24 What is a Significant Error? or When MUST I?
14 What is a Significant Error? For our discussion 12.5 is correct value. Name a test that could have this value PT, BUN, Hemoglobin. Which of these values is wrong? or When do I freak? When do I freak? Mean YOU CLIA Your Lab Group Limit & Mean Mean Error budget CLIA LIMIT
15 When do I freak? my 3 CV range error budget Freak O mean x My mean Freak? Freak + 28 Selecting the Rules: An Example From CAP My Group Acceptable ~ Error Value Mean SD Range Budget CVs I (5) 2 II (9) 6 III (10) 7 IV (7) 4 V (10)
16 Platelet QC CAP YOU Platelet QC CAP YOU
17 An Example 300 runs/yr with 3 controls/run limits at 3 CV% and 1.0% Failures Good data Bad data In 298 good runs TA (297reported) 2 TR Out 32 3CV 2CV 1 3 CV% Systematic? Or Increased random error? x... o Mean x x 2CV 3CV x o x o o x x o o o A value could exceed 3 S for many reasons -- random control material short sample mix up in control systematic reagent calibration thus 1 3 CV difficult to troubleshoot without more information
18 Document! Changed Lot 123.MMP. Expires signed by DSP Instrument Self Checks Pressure Vacuum Background Microprocessor Mechanical parts Temperature.are all monitored continuously and will give an error message if a measurement is out of specs
19 Delta Checks Absolute Delta Hemoglobin 11/10/ /11/11 9.2? WBC 05/09/ /22/12 4.1? Johnson and Stelmach Clin. Lab News September, Patient Moving Average A QC tool developed by Dr. Brian Bull in This algorithm is based on the inherent stability of the red blood cell indices in a general hospital populations. Utilizes patient data, recording the MCV, MCH and MCHC of each patient sample. Monitors stability over time of: Instrumentation Reagents Technique Patient population
20 Average of Normals 5 Patient Runs of Control Patients Mean SD % % Patient Average
21 Advantages of the Patient Moving Average Inexpensive, simple to use Utilizes unfixed patient blood Incorporated into current Hematology analyzers Real time QC 40 Installing X Series: Xm Settings Xm must be turned ON Set Xm batch size Set Sampler Stop Conditions (QC Errors) Assign QC Limits Enter lab established Xm Limits Assign Variable Target for Xm Calculate lab s Historical limits
22 Patient Moving Averages X-bar-M Effective in checking hour-by-hour changes in instrument and reagents Parameters remain stable once characteristics of population established and the population is stable Does not include: ID number zero Commercial QC data Calibration data Background counts that exceeds linearity range those are unreliable data ( *) Data reported with analysis error displayed as **** or QC Troubleshooting Tool Concern? Commercial QC - OK Xm - OK Commercial QC - OK Xm - Not OK Commercial QC - Not OK Xm - OK Commercial QC - Not OK Xm - Not OK No Problem Population Shift or Reagent Control problem? Systematic Error 221
23 Time for more questions & discussion 44 Tinkerbell
24 Thank You
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