12. Sampling ABL800 FLEX Operator's Manual
Causes of errors in preanalytical phase, Continued
Selection of
anticoagulant
To avoid introduction of clotted blood samples into the analyzer which may give
inaccurate measurement results and cause analyzer damage, Radiometer
recommends the following:
Exclusive use of preheparinized sampling devices
•
Exclusive use of dry heparin, preferably of sodium or lithium
•
•
Do not use liquid heparin as this causes dilution of the sample [1]
Use heparin in sufficient concentration. The recommended concentration
depends on the sampling device and specific blood sample – please refer to
documentation for specific sampling devices.
•
Use electrolyte-balanced heparin to minimize bias from heparin on
electrolyte values
•
CAUTION – Risk of erroneously high results
Do not add sodium fluoride to the blood samples, as it gives erroneously
high cNa
+
and low cCa
2+
, cGlucose and cLactate results. Sodium fluoride
also damages the Glucose and Lactate electrodes.
Preparing the
patient
The respiratory condition of the patient should be stable.
• The patient should preferably be in a steady state of ventilation before and
during the collection of blood sample
• The patient should be informed about the procedure in order to avoid
unnecessary anxiety. If the patient hyperventilates due to anxiety, for example,
pH and blood gases may be affected.
12-4
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