Mindray BC-3000 Plus - Page 201

Using the QC Programs
8-35
Figure8-42“
X
－R Graph”screen
Every screen displays the
X
and R graphs of one parameter.
The
X
graph can be interpreted as follows:
 The x-coordinate represents the number of the
X
-R analyses performed; the
y-coordinate represents the results of the
X
-R analyses;
 For every parameter, its
X
graph can display maximum 31 points;
 For every parameter, the center dash line represents the
X
(average of all the
X
-R
analyses performed);
 For every parameter, the upper dash line represents the upper control limit =
X
＋A×
R
;
 For every parameter, the lower dash line represents the upper control limit =
X
－A×
R
;
 For every parameter(e.g. WBC), the three numbers to the left of the graph are:
10.2 –
X
＋A×
R
;
10.1 –
X
;
10.0 –
X
－A×
R
.
The R graph can be interpreted as follows:
 The x-coordinate represents the number of the
X
－ R analyses performed; the
y-coordinate represents the difference between the two runs of every
X
－R analysis;
 For every parameter，its R graph displays maximum 31 points;
 For every parameter，the center line of its R-graph represents the average of all the
differences
R
;
 For every parameter，the upper dash line represents the upper control limit B×
R
;