1.17: Quality Control
- Page ID
- 38597
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- In establishing the 95% confidence limits for a particular method for a quality control program, one would expect how many test results to fall beyond the limits of allowable variation by chance?:
- one in 95
- one in 5
- one in 10
- one in 20
- one in 30
- A laboratory test has ± 2 SD control limits of ± 5. The mean, target value is 15. How many days was the method out of control during the two week period shown?:
- 1
- 2
- 3
- 4
- 5
| Day | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Value | 11 | 13 | 18 | 7 | 22 | 28 | 15 | 14 | 26 | 14 |
- The 68% confidence limits of a glucose control are 750-850 mg/L. A control and a series of patient specimens are run. The control reads 750 mg/L. If control results must be within ± 2 SD, what action should you take?:
- report out patient results, since control results are within acceptable limits
- repeat the control, since control results are out of control; if repeat results are in control, report out patient results
- repeat both the control and all patient specimens using same methodology
- repeat both the control and all patient specimens using different methodology
- run second control if within range, report patient results
- A medical technologist should never use the pattern of patient results, i.e. abnormal values, as an indicator of instrument performance.
- true
- false
Use the following Key to answer Questions 5-7:
- 1, 2, and 3 are correct
- 1 and 3 are correct
- 2 and 4 are correct
- 4 only is correct
- all are correct
- Which of the following is/are acceptable quality control pool material?
- frozen
- lyophilized
- low temperature liquid
- fresh patient samples
- When performing an analysis on a stat. analyzer, a quality control sample should be run:
- during the first shift
- depending upon the proven stability of the test system
- by each technologist
- usually at least once every 8 hour shift
- If the quality control sample is out of range (>3 SD), the technologist should:
- recalibrate the instrument
- troubleshoot the instrument
- record the out-of-range result on the QC chart
- notify the supervisor if the problem cannot be solved within 30 minutes
- Calibrators may be used as quality control pools if:
- the usual quality control pools are expired
- the usual quality control pools just won’t ‘come in range’
- there is a temporary shortage of the usual quality control pools
- there are no quality control materials that contains the analyte
- never
- Answer
-
- d (p. 390)
- b (p. 391)
- a (p. 346, 391)
- b (p. 392)
- a (p. 388)
- c (p. 387-388, 399)
- e (p. 393)
- d (p. 396)