Cholestech LDX - Control Range Calculation Form

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CONTROL RANGE CALCULATION FORM
1. Record the date in Column 2 and
the initials in Column 3.
2. Record the results of the
quality control material in
Column 4 – RESULT.
3. Calculate the MEAN (X
–
): Add the
values (Column 4) in the RESULT
Column then divide by the number
of results (n):
MEAN (X
–
) =
4. Calculate the difference between
each RESULT and the MEAN (X
–
)
and record in Column 5
(RESULT – X
–
).
5. Square each value in Column 5
and record in Column 6
(RESULT – X
–
)
2
.
6. Add the values in Column 6.
7. Calculate the standard deviation
(SD) using the formula:
Divide the sum of the values
calculated in Column 6 by the
number of values minus 1. Take
the square root of this number.
SD=
8. The control range is the
MEAN (X
–
) ± 2SD, record above.
-
()
(Results – X
–
)
2
n – 1
12 3 4 5 6
No. Date Init. 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
Control Name Lot No. Analyte
Cassette Lot No. Cholestech LDX Serial No.
Accept Reject Director Approval Approval Date
Results
n