Mr. Shashikant G. Mahadik, Scientific Officer, Hematopathology, TMH
- Plotting of Levey-Jennings chart - Application of Westgard Rules - Calculation of coefficient of variance
Control Material Commercial / In-house (for coagulation) Tri-levels 1 st or 3 rd party controls Monitoring of control L-J charts, Westgard rules and %CV
Accuracy : Closeness of a result to the true value Precision : refers to the reproducibility of a result You cannot have accuracy without precision, but can have precision without accuracy
Calibration : is done to standardize the instrument for accuracy Calibrator : is a certified reference material used calibrate a measurement on analyzer
Why do laboratory errors occur? Inadequate Understaffed & Underequipped Poor Workload Management Time Pressures Poor Sample Control Poor Results Verification Inadequate Internal Quality Control (IQC) & Assessment (EQAS) Attention To Detail Poor Quality Management Non-validated Tests
ISO 15189
The Levey-Jennings Chart's Inventors In 1931, Dr. Walter Shewhart, a scientist at the Bell Telephone Laboratories, proposed applying statistical based control charts to interpret industrial manufacturing processes. In 1950, S. Levey and E.R. Jennings suggested the use of Dr. Shewharts control chart in the clinical laboratory. Father of statistical quality control