RADIOMETER ABL800 FLEX Operator's Manual page 370

12. Sampling
Causes of errors in preanalytical phase,
To avoid introduction of clotted blood samples into the analyzer which may give
Selection of
inaccurate measurement results and cause analyzer damage, Radiometer
anticoagulant
recommends the following:
•
•
•
•
•
Preparing the The respiratory condition of the patient should be stable.
patient
• 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
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
also damages the Glucose and Lactate electrodes.
ABL800 FLEX Operator's Manual
Continued
2+
, cGlucose and cLactate results. Sodium fluoride