Healthcare Rules

There are five Healthcare rules for control charts

Healthcare RulesĀ are the original set of four control chart rules used to conduct stability analysis. Healthcare RulesĀ can be used with all control charts.

What are the four Healthcare control chart rules?

  1. One point above UCL or below LCL
  2. Two points above/below 2 sigma
  3. Eight points in a row above/below the center line
  4. Six points in a row ascending or descending
  5. 15 points in a row inside Zone C

Here are examples of Healthcare Rules 1, 2, 3 and 4

Healthcare Rule 1:
One point above UCL or below LCL

weco rule 1

Healthcare Rule 2:
Two points above/below 2 sigma

weco rule 2

Healthcare Rule 3
Eight points in a row above/below the center line

weco rule 4

Healthcare Rule 4
Six points in a row ascending or descending

control chart rule 5

Healthcare Rule 5
15 points in a row "hugging" the center line

control chart rule 6


Healthcare rules and many other rule sets are available in QI Macros add-in for Excel

Healthcare control chart rules

QI Macros use Montgomery's Rules as the default. However, you can easily switch to the Healthcare Rules using the QI Macros menu. See How to Change Control Chart Rules in QI Macros.


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