ABL90 FLEX reference manual 7. Performance characteristics
7-3
Definition of terms
The bias of a quantity is defined as the mean difference between the measured value
on a group of test instruments and the estimated true value (as assayed by the
reference method or certified standard reference material). Bias
Prim.Ref
is determined as
follows:
Bias
Prim.ref
= X
ABL90 FLEX
X
Primary Reference method
Bias
Sec.Ref
is a relative bias between the ABL90 FLEX analyzer and the ABL735 analyzer
in macromode (C195 µL mode), and is determined as follows:
Bias
Sec.ref
= X
ABL90 FLEX
X
ABL735
Bias given in the tables in this chapter have been obtained experimentally.
Parameter Primary Reference Method
Secondary
Reference
Method
Reference
pH Capillary-type glass pH electrode
with a saturated calomel reference
electrode and a liquid junction
saturated with KCl (BMS Mk2).
The calibration standards are
traceable to the Primary Reference
Standards for pH.
ABL735 [Ref. 1,2]
pCO
2
Tonometry.
The gases used for tonometry are
traceable to NIST-certified Standard
Reference Materials.
N/A [Ref. 3]
pO
2
Tonometry.
The gases used for tonometry are
traceable to NIST-certified Standard
Reference Materials.
N/A [Ref. 3]
cCa
2+
Calcium transfer standards were
used. These are traceable to NIST
SRM 915 and SRM 956b and have
an ionic strength of 160.0 mmol per
kg of water and pH 7.40 at 37 °C,
using 1 mmol/L (37 °C) HEPES
buffer.
ABL735 The
standards
were
produced as
indicated in
[Ref. 4]
cCl
-
NIST-certified Standard Reference
Material SRM 909b (human serum)
and SRM 956b.
ABL735
cK
+
NIST-certified Standard Reference
Material SRM 909b (human serum)
and SRM 956b.
ABL735
cNa
+
NIST-certified Standard Reference
Material SRM 909b (human serum),
NIST 956b and Radiometer-specified
standard serum material (specified
using flame photometry).
ABL735
Bias
Reference
methods
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