03/03/2026
Student Nurse Must-Know: How a Pulse Oximeter Really Works
If you’re a student nurse in the UK, you NEED to understand pulse oximetry.
This carousel breaks down SpO₂, how the sensor works, why red & infrared light matter, what affects accuracy, and the normal oxygen saturation ranges you’ll use every single day on placement.
You’ll learn:
• What a pulse oximeter actually measures
• How light absorption shows oxygenated vs deoxygenated Hb
• When SpO₂ readings may be wrong (cold hands, nail varnish, CO exposure, motion)
• Normal SpO₂ ranges for adults, COPD patients & red-flag hypoxia
• Where you’ll use SpO₂ monitoring: A-E assessments, NEWS2 scoring, ED, ICU, Respiratory, AMU
• The R.I.P.P.L.E mnemonic to remember key concepts quickly
Perfect for OSCE prep, placement revision, and building confidence with real-world clinical assessments.
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