Standards · Standard or regulation
ISO 80601-2-61
Medical electrical equipment, Part 2-61: Particular requirements for pulse oximeter equipment
In plain words
What it covers.
The particular standard for pulse oximeters. It sets how accurate the SpO2 reading must be (tested against arterial blood samples in volunteer studies), how the accuracy must be stated, alarm behaviour, probe heating limits and labelling. It also reminds users that motion, poor perfusion, nail varnish and skin pigmentation can affect readings.
Who uses it: Oximeter manufacturers and regulators; clinical engineers investigating suspicious readings or alarm delays.
A summary written by BMEssentia for learning, not the text of the standard. Always work from the current official edition and the manufacturer's instructions.
It covers
- SpO2 accuracy (Arms) over 70 to 100 percent
- Controlled desaturation studies
- Pulse rate accuracy
- Probe surface temperature limits
- Alarm requirements
- Data update period and averaging
Key points
What engineers need to know.
- Accuracy is stated as Arms, a root-mean-square error, usually 2 to 3 percent across 70 to 100 percent SpO2.
- Accuracy is proven in human desaturation studies, not with a simulator.
- An SpO2 simulator checks the device and probe chain, not true clinical accuracy.
- Probe skin contact temperature must stay at or below 41 °C to avoid burns.
- Averaging time and data update period affect how fast a desaturation alarm appears.
- Darker skin pigmentation can cause overestimation; newer guidance demands wider test groups.
Devices
Devices it applies to.
Each device in the Medical City Device Lab, with its Device Library course on the Platform.
Medical City
Where you practise it.
- S1-M002 The Dirty Probe
- Story Three oximeter incident and reproduction (S3-M002, S3-M040)
- Design Studio equitable oximeter project