Home Products Most Popular Contact
No items in your cart.
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 123 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


  • A trend shows a slow movement of the data mean from one level to another.
  • A trend is indicative of a systematic error that is occurring slowly, such as reagent deterioration, control deterioration, or a lens getting progressively dirtier.
  • In the example to the right, some type of systematic error began on day 6, and by day 10, we can say that a trend has occurred and results are out of control.
  • Be on the lookout for trends as they begin to take shape, and you may be able to avoid further quality control problems.