ABL800 FLEX Operator's Manual 1. Introduction
Limitations of use and known interfering substances,
Continued
Substance Interference
Anticoagulants (sampling) Anticoagulants that contain sodium salts will
give erroneously high
cNa
+
results. Sodium
fluoride with or without EDTA and oxalate
(di Na) influence
cGlu results. Sodium fluoride
gives erroneously high
cNa
+
and low cCa
2+
,
cGlu and cLac results. Tri sodium citrate
influences
cNa
+
, cK
+
and cGlu results.
Thus Radiometer recommends the exclusive use
of heparin as anticoagulant. Solutions containing
organic preservatives may damage the ion-
selective membranes of the
cK
+
and cGlu
electrodes when introduced into the analyzer.
Do not use EDTA, as it leads to erroneous pH,
pCO
2
, cNa
+
, cK
+
and cCa
2+
results. Use of
EDTA will also affect subsequent measurements
on the Ca electrode and it will reduce the
lifetime of this electrode.
Thiocyanic acid (degradation
product from treatment with
nitroprussid. Also produced in
thiosulphate treatment of cyanide
poisoning)
Erroneously high
cGlu and cLac measurements.
Glycolic acid (ethyleneglycol
degradation product)
Erroneously high cLac measurements.
Insufficiently stabilized blood.
Caustic fluids (e.g. strong acids
or bases, detergents, etc.).
Fluids that precipitate.
Fluids that affect the sensor
enzymes.
Fluids that form complexes with
the analyzer solutions (calcium).
High viscosity fluids.
Hydrophobic fluids.
Reactive fluids.
Other fluids mode allows you to measure on
fluids other than heparinized human blood.
Be aware that some substances, such as listed in
the left column, measured in the Other fluids
mode may damage the instrument or the
electrodes. This can affect the subsequent
measurement on human blood or quality control
solutions.
CAUTION -
Known
interfering
substances
(continued)
Continued on next page
1-5
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