One of the assays your laboratory carries out requires a 2N HCl.  You have a stock bottle of concentrated HCl with a specific gravity of 1.18 and purity of 36%.  What volume of the concentrated HCl is required to make 250mL of the 2N HCl (MW of HCl = 36.5 Da)?

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?