Siemens Rapidlab 1200, Operator'S Manual, Page: 140 / 448

4-10 Rapidlab 1200 Operator’s Guide: Quality Control
02087462 Rev. V
The mean value is defined as the sum of all results divided by the number of results,
according to the following formula:
• SD(R), standard deviation with RiliBÄK range checking defined according to the
following formula:
• SD(R) as a percentage, standard deviation as a percentage with range checking
defined according to the following formula:
• SD( ), standard deviation against the mean is defined according to the following
formula:
• CV, coefficient of variation is defined according to the following formula:
• N, number of samples included for these statistics.
NOTE:
For RMSD and RMSD%, a minimum of 15 samples is required. If fewer than
15 samples are analyzed, the field is blank. For Standard Deviation and Coefficient of
Variation, a minimum of 5 samples is required. If fewer than 5 samples are analyzed,
the field is blank.
NOTE:
If a sample is out of range it may skew QC Analysis results. To exclude a
sample you suspect is out of range, see Using the QC List Screen ‚ page 4-7.
NOTE:
Low and high AQC and RQC ranges are adjusted to adhere to the
RiliBÄK 2008 requirements that define deviation from target ranges.
NOTE:
CO-ox fractions for F O
2
Hb, F
COHb
, F MetHb, and F HHB are not adjus
ted.
N
x x x
x
N
x N
i
N
i
+ + +
= Σ =
=
L
2 1
1
1
2
arg
1
) (
1
et t
n
i
i
x x
n
RMSD
− =
∑
=
100 * ) / ( %
arg et t
x RMSD RMSD
=
x
2
1
) (
) 1 (
1
x x
N
S
i
N
i
− Σ
−
=
=
% 100
× =
x
S
CV