Pulse Oximeter Accuracy (Arms) From Paired Readings
Pulse oximeter accuracy from paired SpO2 and co-oximeter readings: Arms, bias and Bland-Altman limits for repeated measures.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Sensor type
- Transmittance (wrap or clip)
- Pairs, one per line
- a, 91, 90 a, 93, 90 b, 92, 90 b, 94, 90 c, 90, 90 c, 92, 90
Result: Arms 2.38% over all pairs (within the 2013 guidance's typical 3.0% for this sensor)
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Sensor type
- Pairs, one per line: subject, SpO2, SaO2
- Subjects: subject, dark yes/no, MST 1-10, ITA, sex
How this is calculated
Citation
FDA, Pulse Oximeters - Premarket Notification Submissions [510(k)s] (2013, Table 3) and the January 2025 draft guidance (Arms definition, enrollment and bias criteria); Bland JM, Altman DG. J Biopharm Stat 2007;17:571-582. Read the sources: FDA 2013 guidance ↗, FDA 2025 draft ↗, Bland and Altman 2007 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.