24 Handheld Pulse Oximeter (Reorder No. 36403)
5. TAKE A MEASUREMENT (Continued)
5.1 Factors That May Affect The Measurement
During operation, the accuracy of oximetry readings can be
affected by the following factors:
5.1.1
Instrument performance depends on the pulsatile
character of the artery. The display would not be
considered reliable and accurate if the following conditions
are present during measurement.
• Shock or cardiac arrest
• Temperature of the unit
• After the administration of a cardiovascular drug
• Anemia
• Evidence of ventilation-perfusion mismatch
5.1.2
Instrument performance depends on the wavelength
absorption for oxyhemoglobin and deoxyhemoglobin. If
there are substances absorbing the same wavelength, this
would induce false or low SpO
2
values. The following may
affect these values:
• carboxyhemoglobin
• methemoglobin
• methylene blue
• Indigo carmine
5.1.3
Extremely high illumination could affect the SpO
2
measurement. Use a semi-translucent or opaque cover to
shield the sensor.
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