User's Manual

6. SpO
2
Monitor (LX-7230KM)
37
CAUTION
The accuracy of the SpO
2
measurement may be influenced by abnormal
hemoglobin, such as carbon monoxide hemoglobin (COHb) and
methemoglobin (MetHb). It may be also affected by cardiogreen or
intravascular dyes.
HbCO METHEMOGLOBIN
SpO
2
1% 5% 10% 1% 5% 10%
50% -0.1% -0.7% -1.5% 0.2% 1.3% 3.2%
70% -0.1% -0.7% -1.5% -0.6% -2.3% -3.2%
90% -0.2% -0.8% -1.6% -1.5% -6.0% -9.6%
100% -0.2% -0.8% -1.7% -1.8% -7.5% -12.2%
Note
The value will be displayed
lower than the actual value.
The value may be
displayed higher than the
actual value when the SpO
2
value is around 50%.
The following case may affect the accuracy of SpO
2
and pulse rate
measurement.
 Outside light (direct sunlight, fluorescent, light therapy equipment,
surgical light, infrared heat ramp, etc.)
 Hypoperfusion
 Excessive body motion (patient’s motion)
 Pigment injected to the blood for testing
 In case of measurement during receiving CPR treatment
 Placement of SpO
2
sensor on limb with a blood-pressure cuff, arterial
catheter
 External colorant such as nail polish
 Abnormally low or high hemoglobin concentration
 Venous pulse
 Electrosurgery
 Influence of electromagnetic waves from other electronics
 High-intensity radio waves from cell phone