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Author Question: The precision limits of a method are defined by: a. The mean b. The SD c. Sensitivity d. ... (Read 90 times)

LCritchfi

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on: Jun 25, 2018
The precision limits of a method are defined by:
 
  a. The mean
  b. The SD
  c. Sensitivity
  d. Specificity

Question 2

Which of the following would most likely be associated with the situation described in Question 11?
 
  a. Operator error
  b. Fading light source
  c. Instrument miscalibrated
  d. Starting a new lot number of thromboplastin reagent


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maya.nigrin17@yahoo.com

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Evaluating the same specimen multiple times and applying statistics to the results determine precision or reproducibility. The SD describes the precision. The mean is the average result (assuming a gaussian distribution). Sensitivity describes how well a test identifies positive patients, whereas specificity is how well it identifies only positive patients.

Answer to Question 2

ANS: D
Shifts can occur when a new reagent is introduced. A fading light source would lead to trend error. If the instrument were calibrated incorrectly, then both controls should be out; likewise, operator error would result in both controls being unacceptable.


LCritchfi

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Reply #2 on: Jun 25, 2018
Thank you :)


maya.nigrin17@yahoo.com

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Reply #3 on: Jun 25, 2018
Happy to help you


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