The page below is a sample from the LabCE course Quality Control. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Quality Control (online CE course) »
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 97 CE courses, most popular
$95 Add to cart
Pick Your Courses
Up to 8 CE hours
$50 Add to cart
Individual course$20 Add to cart

Shifts

  • A shift, on the other hand, describes a sudden change in the data mean that persists throughout further days of testing.
  • Shifts can be caused by any one of a number of reasons, including persistent instrument malfunction, loss of calibration, or improper reagents.
  • Shifts are often easier to recognize than trends, as the data may be more clearly suspect.
  • Again, shifts must be corrected as soon as possible, as patient data are most likely already invalid.
  • In the example to the right, the large jump on day 8 followed by persistently high control values means that a shift has occurred.