6-2 Rad-57 Signal Extraction Pulse CO-Oximeter Operator’s Manual
6
PROBLEM POSSIBLE CAUSE(S) RECOMMENDATION
LOW SIGNAL
QUALITY
Improper sensor type or
application.
Excessive motion relative
to perfusion.
Sensor is damaged or not
functioning.
Check and see if blood flow to the site is
restricted.
Check the placement of the sensor.
Re-apply sensor or move to a different site.
SpO
2
VALUES DO
NOT CORRELATE
WITH CLINICAL
ASSESSMENT OR
ABGS.
Low perfusion or sensor
displacement.
Check for error messages. See section
5 System Messages for recommended
corrections.
Check placement of sensor or if it is too
tight. Reapply sensor or select a new site.
Set to MAX sensitivity and confirm that the
sensor is securely on the patient.
Refer to sensor Directions For Use.
UNEXPECTEDLY
HIGH SpO
2
, SpCO
OR SpMet READING
Low SIQ or Perfusion
Index (PI) values
Reposition sensor to site with strong SIQ
and PI. Average readings taken from three
different sites to improve accuracy. Submit
blood sample for laboratory CO-Oximetry
test for comparison.
Inappropriate sensor size
or sensor measurement
location.
Verify proper sensor for patient size.
Verify proper sensor site.
UNEXPECTEDLY
HIGH SpCO
READING
Possible elevated
methemoglobin level*.
Submit blood sample for laboratory CO-
Oximetry test.
DIFFICULTY OR NO
SpO
2
/SPCO/SPMET
READING
Low battery/ not plugged
into AC power supply.
Insert handheld into docking station, verify
docking station power cord plugged in and
docking station power indicator light is
illuminated.
Interference from line-
frequency induced noise.
Verify/set 50/60hz menu setting. Refer to
Section 3, Initial Setup for details.
Inappropriate sensor or
sensor size.
Verify proper sensor and sensor size for
the patient.
Excessive ambient or
strobing light.
Shield the sensor from excessive or
strobing light.
Also, see Section 4, Successful Monitoring for additional information.
PULSE SEARCH
MESSAGE
The device is searching
for pulse.
If device fails to display within 30 seconds,
disconnect and reconnect. If pulse search
continues, move sensor to better perfused
site.
DIFFICULTY OR
NO SpCO/SpMet
READING
Excessive motion
Minimize or eliminate motion at the
monitoring site.
Inappropriate sensor or
sensor size.
Verify use of an SpCO/SpMet capable
sensor. Verify proper sensor size for the
patient.
* As with all CO-Oximeters, elevated methemoglobin levels may cause falsely elevated
carboxyhemoglobin values.
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