Quality Control

Question 1

which of the following QC rules would be broken 1 out of 20 times by chance alone

Answer 1

one 2s

Question 2

which of the following conditions is cause for rejecting an analytical run?
a. two consecutive controls greater than 2s above or below the mean
B. 3 consecutive controls greater than 1s above the mean
c. four controls steadily increasing in value but less than 1 s from the mean
d. all of the above

Answer 2

a

Question 3

one of the two controls within a run is above +2s and the other control is below -2s from the mean. what do these results indicate

Answer 3

poor precision has led to random error

Question 4

A trend in QC results is most likely cause by

Answer 4

deterioration of the reagent

Question 5

A shift in QC results is most likely cause by

Answer 5

miscalibration of the instrument or improper dilution of standards

Question 6

A random error in QC results is most likely cause by

Answer 6

electronic noise