Cholestech LDX - Precision Calculation Form (Within-Run)

< TABLE OF CONTENTS
X
–
=
SD=
%CV=
1. Record the result of the
quality control material in
Column 2 – RESULT.
2. Calculate the MEAN (X
–
): Add the
values (Column 2) in the RESULT
Column then divide by the number
of results (n):
MEAN (X
–
) =
3. Calculate the difference between
each RESULT and the MEAN (X
–
)
and record in Column 3
(RESULT – X
–
).
4. Square each value in Column 3
and record in Column 4
(RESULT – X
–
)
2
.
5. Add the values in Column 4.
6. Calculate the Standard Deviation
(SD) using the formula:
Divide the sum of the values
calculated in Column 4 by the
number of values minus 1. Take
the square root of this number.
SD=
7. To calculate the coefficient of
variation (%CV), use the following
formula:
%CV=
SD
x 100
X
–
Results
n
-
()
(Results – X
–
)
2
n – 1
PRECISION CALCULATION FORM (WITHIN-RUN)
Date Operator Specimen Identification Analyte
Cassette Lot No. Cholestech LDX Serial No.
Accept Reject Director Approval Approval Date
12 3 4
No. Result Result – X
–
(Result – X
–
)
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SUM ( )
NOTES