Flashcards in Quality Management Deck (44)

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1

## The higher the SD result means

### lower precision

2

##
1. SD result of >2 indicates

2. SD result should be <2

a. lower precision

b. higher precision

### A B

3

## Percentile expression of the mean. Aka Total Percent Error. Index of precision.

### Coefficient Variation

4

## Formula of CV

### CV= SDx100/Mean

5

##
Limits between which we expect a specified

proportion of population to lie

### Confidence limits

6

## standard reference limit for normal distribution

### 95%

7

##
Normal Frequency Curve, Normal Distribution

Curve

### Gaussian Curve

8

## Also known as Bell-shaped curve

### Gaussian Curve

9

## this is where you plot the result, where SD are placed

### Y-axis

10

## this is where you plot the frequency, where DAYS are placed

### X-axis

11

##
CUSUM data elements are centered around the mean

with most elements close to the mean. TRUE OR FALSE.

### False

12

## If a random error is present the curve in gaussian curve becomes

### wider & shorter

13

##
Used to compare results using different

samples or one sample using two different

methods and for systematic error detection

### Twin plot

14

## In bell-shaped curve, one specimen will be plotted to the Y axis and the other specimen will be plotted to the X axis. TRUE OR FALSE.

### False

15

##
Calculates the difference between QC results

and the target means

### Cumulative sum graph

16

##
Most widely used system in clinical laboratories. A graphic representation of the acceptable limits

of variation in the results of an analytical method. Detects both random and systematic error.

### Shewart Levey-Jennings chart

17

##
Levey-Jennings Chart: Before plotting this chart, you have first to compute for the 8 statistical parameters

specifically, the SD and the Mean. TRUE OR FALSE.

### True

18

##
Done by subtracting the mean from the

individual values and the cumulative differences

are plotted. Give the earliest indication of systematic error.

### Cumulative sum graph

19

##
The mean should be written in one solid line

whereas the confidence limit should be written

using broken lines when making

### Shewart Levey-Jennings chart

20

##
Control values that lies in _SD and _SD and beyond is a sign of potential problem. You have to run a new

control and repeat specimen testing.

### 2 & 3

21

##
is considered in control when

there is symmetrical distribution of control values

about the mean and there are only few control

values outside the 2SD control limit

### Analytical method

22

## Errors which can be observed on LJ chart: Gradual change in the mean that proceed in one direction. Control values either increases or decreases for six consecutive days.

### Trend

23

##
Causes of trend are improper calibration of

instrument, new lots of standards and reagents. TRUE OR FALSE.

### False

24

##
Causes of shift are deterioration of reagents, light

source, control materials. TRUE OR FALSE.

### False

25

## An abrupt change in the mean that becomes continuous. Control values that distribute themselves on one side or either side of the mean but do not pass the mean for six consecutive days.

### Shift

26

## Also known as “Multirule Quality Control” used in the laboratory for internal and external QC.

### Westgard Control Rule

27

##
Control rule to indicate if the analytical process

is “in control” or “out of control”

### Westgard Control Rule

28

## One control result exceeds the mean by more than +/- 2SD & 3SD should be rejected (random error). TRUE OR FALSE. What error is that?

### True, 12s &13s

29

## Two consecutive control results/days exceed the mean by 2 more than 2SD is a systematic error. TRUE OR FALSE. What error is that?

### True, 22s

30