Quality Control Flashcards
providing the most reliable patient laboratory results and to minimize errors in the pre-analytical, analytical, and post-analytical phases. In is now known as
Quality assessment
is an aspect of quality assessment that is used to assess the analytical phase of patient testing.
Quality control
is the process by which an agency or an organization evaluates and recognizes a program of study or an institution as meeting certain predetermined qualifications or standards applies only to institutions and programs.
Accreditation
PHASES OF ANALYSIS
Pre-analytical Phase
Analytical Phase
POST-ANALYTICAL PHASE
Pre-analytical Phase
➢ Patient preparation
➢ Time of collection
➢ Specimen collection order
➢ Quality of specimen collected
➢ Specimen processing, storage, and preservation
Analytical Phase
➢ Maintenance for equipment and instruments.
➢ Calibration of equipment, verification of instrument linearity.
➢ Precision, accuracy, and overall reliability check through the use of
standard materials, quality control samples, procedures, and QC rules.
the nearness or closeness of the assayed value to the true or
target value.
Accuracy
the nearness or closeness of the assayed value to a repeated
value.
Precision
closeness of agreement between results of successive
instruments carried out under the same conditions.
Repeatability
closeness of agreement between results of measurements
performed under changed conditions of measurements
Reproducibility
refers to the ability of the analytical method to maintain
accuracy and precision over an extended period of time.
Reliability
the degree to which a method is easily repeated.
Practicability
ANALYTICAL ERRORS
Systematic Errors
Random Errors
Westgard QC Rules
Systematic Errors
Error that occurs predictability once a pattern of recognition is established, predictable errors of the same sign and magnitude.
Random Errors
Error that occurs unpredictably; affects precision and is the basis for
varying differences between repeated measurements.
