RADIOMETER ABL800 FLEX Operator's Manual page 369

ABL800 FLEX Operator's Manual
Causes of errors in preanalytical phase,
Causes of error
(continued)
Dilution from liquid
heparin
Heparin
interference
Arterial blood
mixed with venous
blood
Instability of patient pH and blood gases
Leakage from red
blood cells
Exposure to
artificial light or
sunlight
Inappropriate
amount of flush
solution is discarded
from the catheter
Infusion solution
given in the same
arm
See also Recommended literature at the end of this chapter.
Cause of error
Electrolytes and
metabolites, cHCO
pCO
Electrolytes,
especially cCa
pH, pO
cK
ctBil
Electrolytes and
metabolites
Electrolytes and
metabolites
* CAUTION – Risk of incorrect results
Always remove air bubbles from a sample before introducing it into the
analyzer. Air bubbles may result in erroneous pO
** CAUTION – Risk of clots
When measurements are flagged always conduct the operator actions
required by the troubleshooting program to prevent possible clots from
remaining in the sample path. Fluid path clots may cause erroneous
measurement results.
Major affected
parameters
Use preheparinized devices with
–
, dry heparin.
3
, ctHb,
2
Use electrolyte-balanced heparin.
2+
, sO Use proper sampling technique.
2 2
• Sample at least 20 minutes after
• Inform patient of procedure
+
Store glass capillary samples for
maximum 30 minutes in cold
(0- 4 °C) condition.
For patients receiving
phototherapy, lights should be
extinguished prior to drawing the
sample.
Discard sufficient volume from
the catheter before taking a blood
sample.
Stop infusion for a period or use
another sampling site.
12. Sampling
Continued
Preventative measures
ventilatory adjustment
values.
2
Continued on next page
12-3