Over 99% of specimen identification errors that occur by laboratory personnel result from:

Over 99% of specimen identification errors that occur by laboratory personnel result from:

Which of these has 1⁄2 of the points above and 1⁄2 below?

What should the mean value of the QC material be in the above chart?

Which of these is affected by extreme values

Which of these is not a measure of variation? 

Suppose a laboratory expands its acceptable limits for quality-control results from 0 ± 2s to 0 ± 2.5s. What is the potential negative aspect of this change?

How many points in the above Levey-Jennings chart are beyond 2SD away from the mean?    

Which of the following best describes the analysis of samples to establish reference intervals for a new laboratory method?

Which of the following are true about quality control pools?   1. Commercially bought lyophilized material is preferred material due to its stability   2. Clarified frozen or liquid pools typically have lower SD.   3. Pool matrix does not have to match test samples.   4. Liquid pools may experience greater instability errors associated with shipping batches of a lot to a customer.