Skip to content
MejoresPulsioximetros.comBuying guides · Canada

Pulse oximeter guides · Canada

What does perfusion index mean on a pulse oximeter?

PI describes the relative strength of the pulse signal where the sensor sits. Learn to tell it apart from the oxygen percentage and check the measurement setup when PI or the display keeps changing.

What the PI number represents

The perfusion index compares the part of the optical signal that changes with each heartbeat with the steady part of the signal. The sensor measures that ratio at the place it is attached. SpO₂ estimates oxygen saturation and pulse rate counts beats per minute.

What can make PI change

Sensor position, local blood flow and the conditions around the reading all matter. A cool fingertip can produce a weaker pulse signal. Movement and a loose or poorly positioned clip can also disturb the reading. Check your device’s instructions for any signal symbol or warning.

What to check before comparing values

  • Keep the hand still and use the finger and position your manufacturer specifies.
  • Allow the display to settle and record the finger or sensor location if you compare readings over time.
  • Treat the device’s PI number as a signal at that spot. For ongoing monitoring or concerning symptoms, follow guidance from your health care provider.

Keep the three values separate

What each label tells you
LabelWhat it describes
SpO₂Estimated blood oxygen saturation
PRPulse rate in beats per minute
PIRelative strength of the pulse signal at the sensor

Pulse oximeters with perfusion index in Canada

Check where PI appears on the display and how you change views. Each button opens the exact Canadian model.

As an Amazon Associate I earn from qualifying purchases.

Compare all featured fingertip pulse oximeters

Sources