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Clinical Chemistry > Quality Control > Flashcards

Quality Control Flashcards

0
Q

The closeness between a test reuly and the true value

A

Accuracy

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1
Q

Quality control chart

A

Levey jennings chart

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2
Q

The closeness of test results to one another

A

Precision

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3
Q

A measure of precision or how well the measurement system reproduces the same result over time

A

Quality control

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4
Q

A chart that contains bith bar and line graph

A

Pareto chart

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5
Q

Comparison of the standard deviation of two samples

A

Coefficient of variation CV

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6
Q

The ability to produce more true positive than few false negative

A

Diagnostic sensitivity

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7
Q

For long term accuracy and precision

A

Interlab

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8
Q

For short term quality and precision

A

Intralab

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9
Q

Mislabelling of samples, temperature changes, dirty optics, voltage fluctualtions

A

Random error

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10
Q

Analyses of control sample together with the patient specimens

A

Intralab

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11
Q

Also known as slope or percent error

A

Proportional error

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12
Q

Present in all measurement and causes imperfection

A

Random error

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13
Q

It is independent of sample concentration

A

Constant error

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14
Q

A measure of central tendency

A

Mean

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15
Q

Error due to instruments operator and environmental conditions

A

Random error

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16
Q

A neasure of accuracy

A

Mean

17
Q

A measure of difference of values from the mean

A

Standard deviation

18
Q

An index of precision

A

Coefficient of variation

19
Q

The ability to produce more true negatives than few false positive

A

Diagnostic specificity

20
Q

Used to determine rederence values

A

Gaussian curve

21
Q

Uses computer implementation

A

Cumulative sum graph

22
Q

Difference between the tested value and the target value

A

Constant error

23
Q

Difference between qc results and the target means

A

Cusum graph

24
Q

Also known as twin plot

A

Youden plot

25
Q

A gradual loss of reliability

A

Trend

26
Q

Control values that can either increase or decrease dor 6 consecutive days

A

Trend

27
Q

A graphic representation of the acceptable limits of variation

A

Shewhart levy jennings chart

28
Q

Control values that distribute themselves on one side or either side

A

Shift

29
Q

A value taht are far from the main set of values

A

Outliers

30
Q

Dergree of flatness or sharpness of peak of a set of values having a gaussian distribution

A

Kurtosis

31
Q

Confidence limit applicable

A

95% (+/-2sd)

32
Q

Control and patient specimen assayed evaluated and reported together

A

Analytical run

33
Q

Examples of systematic error

A 
Trend 
Outliers
Shift
2 2s
4 1s
10x
34
Q

Most commonly used patient based qc technique

A

Delta check

35
Q

Error that cant be easily detected or observed

A

Random error

36
Q

Error that causes inaccuracy

A

Systematic error

37
Q

Produces constant difference

A

Sustematic error

38
Q

Old or contaminated reagents, poor written proceedures, incorect sample and reagent colume

A

Systematic error

39
Q

Involves proficiency testing program

A

Interlab

40
Q

Example of random error

A

Outliers
R 4s
1 2s
1 3s

Clinical Chemistry (6 decks)

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