Identify the reference
Clip-style finger probe in a common portable design. Digital saturation and pulse-rate readout. Light emitter and detector are built into the probe
MEDIVEERSETHE PRACTICAL HUBLOOK CLOSELY / UNDERSTAND CLEARLY
Pulse oximeter
Recognise the device and interpret respiratory observations in clinical context.
REFERENCE GALLERY1 / 1 reference
1
Display
Display: located on the reference instrument. Compare its shape and position with the apparatus used in your practical.
Zoom in, then drag to inspect. Keyboard: + / − to zoom, arrows to pan, 0 to reset. Tap the numbered markers to explore parts.
Pulse oximeter — reference view
Image: Thinkpaul · Source / original · CC BY-SA 3.0Resized and converted to WebP; original colours retained.
Identify and explain
Pulsatile light absorption at red and infrared wavelengths is analysed to estimate SpO₂.
- Clip-style finger probe in a common portable design
- Digital saturation and pulse-rate readout
- Light emitter and detector are built into the probe
Explain the measurement
Pulsatile light absorption at red and infrared wavelengths is analysed to estimate SpO₂.
Interpret in context
Check technique, measurement limitations and the patient’s clinical state; a single value is not a diagnosis.
At the viva table
Try answering aloud, then open the suggested answer. Examiner questions vary.
01 / What does SpO₂ mean?
An estimate of peripheral arterial oxygen saturation derived by pulse oximetry.
02 / Why is the pulsatile component important?
It helps distinguish arterial pulsatile absorption from relatively static surrounding tissue absorption.
03 / Name sources of inaccurate readings.
Movement, poor perfusion and other conditions can affect readings; accuracy can also vary with skin pigmentation and device performance.
04 / Does a normal reading prove ventilation is adequate?
No. Pulse oximetry does not directly measure carbon dioxide or ventilation.