Statistics

Levey-Jennings: Introduced statistical control methods in clinical laboratories in 1950. LJ control charts (really modifications of LJ propositions as made by Henry & Segalove) utilize a stable reference control specimen's values on a specific method & machine, analyzed repeatedly and plotted on a control chart.

? Reference control standards vs. patient samples (biochemical correlation or lack thereof)
? Establishing local control limits, SD, mean, CV