# K243324: Masimo O3 Regional Oximeter

- Pathway: 510(k) (Traditional)
- Applicant: Masimo Corporation
- Decided: Jul 17, 2025 after 267 days
- Product code: MUD (Oximeter, Tissue Saturation)
- Device class: 2
- Regulation: 21 CFR 870.2700
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 17 generations back to K931154 (1993). 54 ancestors in all.
No later device cites it as a predicate yet.
0 of 55 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K214072: Masimo O3 Regional Oximeter System, Masimo Corporation (2022) Summary page 5.

## Indications for use
The non-invasive Masimo O3 Regional Oximeter System and accessories are indicated for use as an adjunct monitor of regional hemoglobin oxygen saturation of blood (rSO2) in the tissue under the sensors in patients in healthcare environments. The O3 Regional Oximeter is only to be used with Masimo O3 sensors. The use of any other sensor is not supported or recommended by Masimo and could give erroneous results. When used with the O3 Adult Sensor, the O3 Regional Oximeter is indicated for measuring absolute and trending regional hemoglobin oxygen saturation of blood (rSO2) in adults = 40kg. When used with the O3 Pediatric Sensor, the O3 Regional Oximeter is indicated for measuring absolute and trending regional hemoglobin oxygen saturation of blood (rSO2) on cerebral sites and trending rSO2 on non-cerebral sites in pediatrics = 5 kg and < 40 kg. When used with the O3 Neonatal Sensor, the O3 Regional Oximeter is indicated for measuring only trending regional hemoglobin oxygen saturation of blood (rSO2) on cerebral sites and trending rSO2 on non-cerebral sites in neonates < 10kg. The AcHb, AO2Hb, AHHb provided as part of the Masimo O3 are indicated for the monitoring of the relative hemoglobin changes of oxygenated hemoglobin (AO2Hb), deoxygenated hemoglobin (AHHDb), and total hemoglobin (AcHb) as measured from the Masimo O3 sensors in adults, pediatrics, and neonates.

Source page: https://510kreport.com/device/K243324
Methodology: https://510kreport.com/methodology