1. Given the following scenario, discuss the acceptance or rejection of an analysis based on quality
control rules, including modified Westgard quality control rules.
QC 1: mean = 100 mg/dL, s = 2.5 mg/dL
QC 2: mean = 203 mg/dL, s = 2 mg/dL.
a. What is the 95% confidence interval for QC1?
b. What is 99% confidence interval for QC 1?
c. What is the 95% confidence interval for QC2?
d. What is the 99% confidence interval for QC2?
e. What rule would you use to evaluate for a shift?
Sketch a Levy-Jennings plot for the analyte given the mean and std. dev. provided from the previous month. You can take a picture with your phone and send as jpg or xls spreadsheet or make it like a table directly in word.
Given the following data were obtained from Control 1 and 2 for glucose during May:
day 1 QC 1: 94 mg/dL
day 1 QC 2: 204 mg/dL.
f. Are any Westgard rules violated on day 1 and if so which rule?
g. What would you decide to do with patient results for day 1?
___2. On six consecutive days there has been a gradual downward change in results from both quality
control samples. This may be solved by:
a. performing a trend analysis.
b. replacing aging controls.
c. replacing electronic board in the instrument.
d. performing %CV calculations.
3. Serum Protein Electrophoresis Scenario
The Densitometric Standard read as follows:
Standard Result Acceptable Range (%)
10% 8-12
20% 18-22
40% 38-42
60% 58-62
80% 78-82
100% 98-102
A. Do these results indicate an acceptable densitometry function?
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