CELL-DYN
®
3200 System Operator’s Manual
11-19
9140181H—October 2001
Section 11
Quality Control
The rules may be used singly or in combination depending on operator preference.
Selections are made on the
QC FILE SET UP
screen.
When a rule is selected, a plus sign is displayed to the right of the parameter name
on the
LEVEY-JENNINGS MENU
screens. (Refer to Figure 11.9.) A minus sign is
displayed if a rule is not selected. Six plus signs indicate that all six rules are
selected in order from left to right.
Figure 11.9 Levey-Jennings Menu Screen Showing Westgard
®
Rule Violations
Whenever a rule is violated, the bulletin line displays the message:
WESTGARD WARNINGS: SEE LEVEY-JENNINGS
The number of the rule that was violated is displayed in place of the plus sign.
Figure 11.9 shows examples of the plus signs and rule-violation indications.
Rule Violations
Only the directly measured parameters need to be monitored with multiple rules.
4
In reference 4 (pp. 190–192), Cembrowski suggests a protocol for using the
Westgard
®
rules in hematology. The following is a synopsis of that protocol.
Because three levels of control are typically used to monitor a hematology
analyzer, it is reasonable to consider all three runs at the same time. In other words,
check for rule violations across the three levels, not just within a particular level. If
the same rule is violated for more than one level, determine whether the violation
indicates a loss of precision or a loss of accuracy and troubleshoot accordingly.
