Levey-Jennings chart

Levey-Jennings chart

A Levey-Jennings chart is a graph that quality control data is plotted on to give a visual indication whether a laboratory test is working well.

On the x-axis the date and time, or more usually the number of the control run, are plotted. A mark is made indicating how far off the actual result was from the mean (which is the expected value for the control).

The distance from the mean is measured in standard deviations (SD). Lines run across the graph at the mean, as well as one, two and sometimes three standard deviations either side of the mean. This makes it easy to see how far off the result was.

Rules, such as the Westgard rules can be applied to see whether the results from the samples when the control was done can be released, or if they need to be rerun.

External links

* [http://www.westgard.com Westgard Q C]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • chart — 1. A recording of clinical data relating to a patient s case. 2. SYN: curve (2). 3. In optics, symbols of graduated size for measuring visual acuity, or test types for determining far or near vision. See …   Medical dictionary

  • Jennings — E.R., 20th century U.S. statistcian. See Levey J. chart …   Medical dictionary

  • Levey — S., 20th century U.S. statistician. See L. Jennings chart …   Medical dictionary

  • Laboratory quality control — is designed to detect, reduce, and correct deficiencies in a laboratory s internal analytical process prior to the release of patient results and improve the quality of the results reported by the laboratory. Quality control is a measure of… …   Wikipedia

  • List of statistics topics — Please add any Wikipedia articles related to statistics that are not already on this list.The Related changes link in the margin of this page (below search) leads to a list of the most recent changes to the articles listed below. To see the most… …   Wikipedia

  • Dean Pitchford — (born July 29, 1951, Honolulu, Hawaii) is an American songwriter, screenwriter, director, actor, and novelist. His work has earned him an Oscar and a Golden Globe Award, as well as nominations for three additional Oscars, two more Golden Globes,… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”