Mr. Shashikant G. Mahadik, Scientific Officer, Hematopathology,
TMH Slide 2 - Plotting of Levey-Jennings chart - Application of
Westgard Rules - Calculation of coefficient of variance Slide 3
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 Slide 4 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 Slide 5 Calibration : is done to
standardize the instrument for accuracy Calibrator : is a certified
reference material used calibrate a measurement on analyzer Slide 6
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 Slide 7 ISO 15189 Slide 8
Slide 9 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 Slide 10 Slide 11
Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18
Slide 19 Slide 20 Slide 21 Slide 22 Slide 23 Slide 24 Slide 25
Slide 26 Slide 27 Slide 28 Slide 29 Slide 30 Slide 31 Slide 32
Slide 33 Slide 34 Slide 35 Slide 36
