unit 6 Flashcards
standards
substance of a KNOWN value
control
known concentration of sample. Used to measure reproducibility
Accuracy
how close a measurement is to a value measured by other measurement
precision
the reproducubilty determined by control samples.
Mean
average of all values
median
middle value within range
Mode
most frequency occurring value
standard deviation
measures variation in distribution of values
shift
an abrupt change from established mean
trend
control values more in same direction on six consecutive days
The joint commission enforces CLIA’88 requires what 4 things?
- Assess the effectiveness of the labs policies and procedures
- Identify and correct problems
- Assure the accurate, reliable, and prompt reporting of test results
- Assure the adequacy and competency of the staff
What is quality assurance?
The process of assuring quality laboratory practices through systematic procedures.
Proficiency testing
used to monitor accuracy of laboratory instrumentation and operates
Proficiency testing is required by what college?
the college of american pathology
what samples are tested in Proficiency testing ?
- Tested at multiple sites
- Multiple methods tested
- Samples must be reported within established range
what happens if there is failure to achieve “acceptable” values for proficiency testing?
- Operator retraining
* Lab prohibited from performing tests
quality control
controls ensure reliability and reproducibility of laboratory assays (tests)
when should controls be tested?
Once a day • When switching reagent lot numbers • Certain maintenance • After calibration • Always before patient testing
what type of chart is used to plot each level of quality control?
levey-jennings chart
how is control range determined on a levey-jennings chart?
by calculating standard deviation
flow of quality assurance?
- doctor orders laboratory test
- orders received by phlebotomist or laboratorian
- patient’s blood is collected
- patient’s blood is collected
- patient’s blood (specimens) are transported to laboratory
- specimens are received and processed by the laboratory
- specimens are tested by appropriate department
- results are tansmitted to ordering doctor
