6-2
Rad-57 Signal Extraction Pulse CO-Oximeter Operator’s Manual
6
PROBLEM POSSIBLE CAUSE(S) RECOMMENDATION
SpO
2
VALUES DO
NOT CORRELATE
WITH CLINICAL
ASSESSMENT OR
ABGS.
Low perfusion or sensor
displacement.
Check for error messages. See section 5=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.
CIRCLING 000'S
(ZERO'S)
Instrument is searching
for pulse.
If Instrument 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.
*available in upgraded Instrument
†
As with all CO-Oximeters, elevated methemoglobin levels may cause falsely elevated carboxyhe-
moglobin values.
Troubleshooting
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