510(k) · Cleared
ClearedMasimo O3 Regional Oximeter
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Masimo Corporation · MUD Oximeter, Tissue Saturation
Cleared on Jul 17, 2025 as substantially equivalent to K214072 (Masimo Corporation, 2022) after a 267-day review. Its family tree reaches back 17 generations to 1993.
- Decided
- Jul 17, 2025
- Review
- 267 days
- Class
- Class II
- Product code
- MUD
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 17 generations to K931154 (1993). 54 ancestors in all, the oldest K850978 (1985). No later device cites it as a predicate yet.
- Root · 17 generations backK931154 Evis 200 SystemOlympus Corp. · 1993
- 13 generations between
- 3 generations backK182429 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2019
- 2 generations backK201432 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2020
- 1 generation backK214072 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2022
- This deviceK243324 Masimo O3 Regional OximeterMasimo Corporation · 2025
Show all 17 generations
- Root · 17 generations backK931154 Evis 200 SystemOlympus Corp. · 1993
- 16 generations backK963033 BF 240/P240/IT240 Bronchovideoscope & AccessoriesOlympus America, Inc. · 1996 · Recalled
- 15 generations backK981543 Olympus LF-TP and LF-DP Tracheal Intubation Fiberscopes, Accessories…The Olympus Optical Co. · 1998 · Recalled
- 14 generations backK002231 LF-DP Gastrointestinal and Sigmoid Fiberscope, Accessories and…Olympus Optical Co., Ltd. · 2001
- 13 generations backK011869 Xenf-DP Rhino-Laryngofiberscope, Its Accessories and Ancillary…The Olympus Optical Co. · 2001
- 12 generations backK040684 T-Stat Microvascular Tissue Oximeter, Model 303Spectros Corporation · 2004
- 11 generations backK051257 Adult Cerebral Oximeter, Model 2040Cas Medical Systems, Inc. · 2005
- 10 generations backK061960 Fore-Sight Cerebral Oximeter Monitor, Model 2040Cas Medical Systems, Inc. · 2006
- 9 generations backK083892 Fore-Sight, Model MC-2000 Series (MC-2000, MC-2010, MC2020, MC2030)Cas Medical Systems, Inc. · 2009
- 8 generations backK091452 Fore-Sight, Model MC-2000 Series (MC 2000, MC2010, MC-2020,MC2030)Cas Medical Systems, Inc. · 2009
- 7 generations backK094030 Fore-Sight Absolute Cerebral and Somatic Oximeter, MC 2000 Series…Cas Medical Systems, Inc. · 2010
- 6 generations backK112820 Fore-Sight Absolute Tissue OximeterCas Medical Systems, Inc. · 2012
- 5 generations backK133879 Fore-Sight Elite Absolute Tissue OximeterCas Medical Systems, Inc. · 2014
- 4 generations backK160526 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2016
- 3 generations backK182429 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2019
- 2 generations backK201432 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2020
- 1 generation backK214072 Masimo O3 Regional Oximeter SystemMasimo Corporation · 2022
- This deviceK243324 Masimo O3 Regional OximeterMasimo Corporation · 2025
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −17 | K931154 | Evis 200 System | Olympus Corp. | 1993 | — |
| −16 | K963033 | BF 240/P240/IT240 Bronchovideoscope & Accessories | Olympus America, Inc. | 1996 | 6 |
| −15 | K981543 | Olympus LF-TP and LF-DP Tracheal Intubation Fiberscopes, Accessories and… | The Olympus Optical Co. | 1998 | 5 |
| −14 | K002231 | LF-DP Gastrointestinal and Sigmoid Fiberscope, Accessories and Ancillary… | Olympus Optical Co., Ltd. | 2001 | — |
| −13 | K011869 | Xenf-DP Rhino-Laryngofiberscope, Its Accessories and Ancillary Equipment | The Olympus Optical Co. | 2001 | — |
| −12 | K040684 | T-Stat Microvascular Tissue Oximeter, Model 303 | Spectros Corporation | 2004 | — |
| −11 | K051257 | Adult Cerebral Oximeter, Model 2040 | Cas Medical Systems, Inc. | 2005 | — |
| −10 | K061960 | Fore-Sight Cerebral Oximeter Monitor, Model 2040 | Cas Medical Systems, Inc. | 2006 | — |
| −9 | K083892 | Fore-Sight, Model MC-2000 Series (MC-2000, MC-2010, MC2020, MC2030) | Cas Medical Systems, Inc. | 2009 | — |
| −8 | K091452 | Fore-Sight, Model MC-2000 Series (MC 2000, MC2010, MC-2020,MC2030) | Cas Medical Systems, Inc. | 2009 | — |
| −7 | K094030 | Fore-Sight Absolute Cerebral and Somatic Oximeter, MC 2000 Series, Models… | Cas Medical Systems, Inc. | 2010 | — |
| −6 | K112820 | Fore-Sight Absolute Tissue Oximeter | Cas Medical Systems, Inc. | 2012 | — |
| −5 | K133879 | Fore-Sight Elite Absolute Tissue Oximeter | Cas Medical Systems, Inc. | 2014 | — |
| −4 | K160526 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2016 | — |
| −3 | K182429 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2019 | — |
| −2 | K201432 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2020 | — |
| −1 | K214072 | Masimo O3 Regional Oximeter System | Masimo Corporation | 2022 | — |
| 0 (this device) | K243324 | Masimo O3 Regional Oximeter | Masimo Corporation | 2025 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1988 | 1 | 0 |
| 1990 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 0 |
| 2003 | 1 | 0 |
| 2004 | 2 | 0 |
| 2005 | 1 | 0 |
| 2006 | 2 | 0 |
| 2008 | 3 | 0 |
| 2009 | 3 | 0 |
| 2010 | 2 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in MUD? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new MUD device
- #1 K223651 Cerebral Adaptive Index (CAI) Algorithmscore 19.8 · 29 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K214072 | Masimo O3 Regional Oximeter SystemSummary page 5…3011353843 Number: Reason for Premarket Expansion of indications for Masimo O3 delta features Notification: Predicate Device: K214072, Masimo O3 Regional Oximeter 1 Device Description The Masimo O3 Regional Oximeter is a noninvasive regional oximeter des… | 2022 |
What descends from it?
No later submission names this one as a predicate yet.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 32 years and passes through 7 companies; a new generation was cleared every 1.7 years on median.
- 8 of the 54 ancestors have a recall of any class.
How does its category compare?
All MUD devicesMUD Oximeter, Tissue Saturation: FDA decisions, review times, recalls and adverse event reports over 20 years. 2025, this device’s year, is highlighted.
FDA decisions per year · MUD
2in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · MUD
124in 2024
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · MUD
1in 2023
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · MUD
131in 2025
MAUDE reports naming product code MUD, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 0 | — | 0 | 0 |
| 2008 | 4 | 72 | 0 | 2 |
| 2009 | 4 | 96 | 1 | 7 |
| 2010 | 4 | 59 | 0 | 1 |
| 2011 | 2 | — | 0 | 2 |
| 2012 | 6 | 211 | 0 | 3 |
| 2013 | 2 | — | 0 | 8 |
| 2014 | 5 | 109 | 0 | 4 |
| 2015 | 3 | 107 | 0 | 0 |
| 2016 | 4 | 167 | 0 | 9 |
| 2017 | 3 | 249 | 0 | 24 |
| 2018 | 3 | 128 | 0 | 38 |
| 2019 | 7 | 88 | 0 | 107 |
| 2020 | 2 | — | 0 | 50 |
| 2021 | 2 | — | 0 | 27 |
| 2022 | 2 | — | 2 | 52 |
| 2023 | 2 | — | 1 | 73 |
| 2024 | 5 | 124 | 0 | 140 |
| 2025 | 2 | — | 0 | 131 |
| 2026 | 1 | — | 1 | — |
What is it indicated for?
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…
Read the full statement (220 words)
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.
Indications for use read by OCR from a scanned FDA summary, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K243324 · printed Nov 6, 2026
Cite this page
510(k) Report. “K243324: Masimo O3 Regional Oximeter.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K243324
Report an extraction error
Are you the manufacturer?
Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026