ANSWERS TO REVIEW QUESTIONS FOR QUALITY ASSURANCE PROGRAM/QUALITY CONTROL CHART
1. Name the sources of quality control sera.
Pooled sera from left over normal sera
Commercially prepare control sera
2. What are the Westgard Rules? Explain briefly.
Random errors are indicated by violations of the 1(2S), 1(3S), and R(4S)
1(2S) - one control value exceeds plus, negative 2 SDs.
1(3S) - one control value exceeds plus, negative 3 SDs.
R (4S) - the difference between the highest and the lowerst control values exceeds 4 SDs.
Systematic errors are indicated by violations of 2(2S), X10, 4(1S)
2(2S) - two control values exceeds plus, negative 2 SDs
X10 - 10 consecutive control values are found on one side of the mean, without crossing the mean.
4(1S) - 4 consecutive control values exceeds plus, negative 4 1SD.
3. How do you construct a Levy-Jennings Chart?
A. Solve for the mean
B. Solve for the SD,
C. Solve for the 1,2,3 SDs
D. Construct your QCC.
E. Plot your control values.
F. Interpret the chart making use of the Westgard Rules.
4. Differentiate a Gaussian from a non-Gaussian distribution curve.
The Gaussian curve is a bell-shaped curve while the non-Gaussian curve is a linear curve.
5. Differentiate a Gaussian Curve from a Levy-Jennings plot.
The Levy Jennings plot is an example of a linear curve.