NomoLine LH Adult Nasal CO2 Cannula with O2, 25/box
The Masimo NomoLine LH Adult Nasal CO2 Cannula with O2 (Mas-3820, 25 per box) Delivers supplemental oxygen to an adult patient and, at the same time, draws a continuous sidestream sample so your monitor can display an end-tidal CO2 number and waveform. It is a single-patient-use cannula on a 2 meter line that connects directly to a Masimo ISA gas analyzer, utilizing a hydrophobic bacterial filter keeps water and contamination out of the analyzer.1
Product Highlights
- Oxygen and capnography through one cannula. The patient gets supplemental O2 and you get a continuous CO2 waveform without a second interface competing for the same face. That matters because supplemental oxygen is exactly the condition under which pulse oximetry stops being an early warning.
- No water trap to empty, drain, or forget. NomoLine wicks condensed moisture into a hydrophilic absorbent and lets it evaporate out through the polymer cover, so the gas sample stays dry without a collection chamber. A hydrophobic bacterial filter protects the analyzer from water intrusion and contamination.1
- Low sampling flow, 50 sml/min. The ISA analyzer draws only 50 sml/min through this line, which is what lets it read accurately on patients with small tidal volumes and fast respiratory rates.3 Masimo specifies accurate measurement from 0 to 150 breaths per minute at that sampling rate.7
- Fast enough to trust the waveform. CO2 rise time at 50 sml/min is 200 milliseconds or less, and total analyzer system response time is under 3 seconds.3 Masimo states that under 3 second figure specifically with a 2 meter sampling line, which is exactly this part.7
- LH means short-term, low-humidity use. Masimo's directions for use define LH as designed for short term applications with low humidity, where the line collects water, and HH as engineered to remove aspirated and condensed water for long term, high-humidity applications.2 That is a duty-cycle distinction, not a room-climate one, and almost nobody publishes it correctly.
- Split-flow cannula with star-shaped O2 tubing. The split-flow design reduces mixing between the delivered oxygen and the sampled gas, and the star-shaped lumen on the oxygen tubing resists kinking.
- Connects straight to the ISA analyzer. Part 3820 is in Masimo's direct-connection group, so no Luer adapter and no multi-patient adapter is needed between the cannula and the analyzer.2
- Single patient use, not made with natural rubber latex, and not to be sterilized by any method, per the Masimo directions for use.2
- 25 per box from Pacific Biomedical at $11.88 per cannula, which is 44 percent below the next national EMS distributor we priced for the same Masimo part number.
Why Sample CO2 Through the Same Cannula That Delivers the Oxygen
A patient on oxygen can stop ventilating adequately and hold an acceptable SpO2 for some time, which means the oximeter reports normal while the problem is already underway. Capnography measures ventilation directly, breath by breath, and that is the argument for a cannula that carries both.
In a randomized controlled trial of 163 children undergoing 174 procedures under moderate sedation, all of whom received 2 L of supplemental oxygen by nasal cannula, blinded capnography indicated alveolar hypoventilation during 56 percent of procedures and apnea during 24 percent, while clinical staff relying on routine monitoring documented poor ventilation in only 3 percent and no apnea at all. Patients in the arm where capnography findings prompted intervention were significantly less likely to desaturate.4 In a separate controlled comparison during sedated colonoscopy, 29 episodes of apnea or hypoventilation occurred in 16 of 50 patients, and pulse oximetry detected only 38 percent of them, with a mean delay of 38.6 seconds on the episodes it did catch. The authors note that this delay is worse when supplemental oxygen is provided.5
Use the device according to the Masimo directions for use2 and your agency's protocols and medical direction.
Specifications and Compatibility
| Specification | Detail |
|---|---|
| Manufacturer | Masimo Corporation |
| Item Number | 3824 |
| Pacific Biomedical SKU | MAS-3824 |
| Product | NomoLine LH Adult Nasal CO2 Cannula with O2 Delivery |
| Humidity Class | LH (low humidity). Designed for short term applications; the line collects water. HH lines are the long-term, high-humidity option.2 |
| Patient Population | Adult, non-intubated, spontaneously breathing |
| Sampling Line Length | 2 meters (approximately 6.5 feet)1 |
| Oxygen Delivery | Integrated. Star-shaped lumen oxygen tubing; connect the supply tubing to the oxygen source and set the flow per your protocol.2 |
| Sampling Flow Rate | 50 plus or minus 10 sml/min at the ISA analyzer3 |
| CO2 Rise Time | 200 ms or less at 50 sml/min sample flow3 |
| System Response Time | Under 3 seconds, specified with a 2 meter sampling line7 |
| Respiratory Rate Range | Accurate from 0 to 150 breaths per minute at a 50 mL/min sampling rate7 |
| Moisture Handling | No water trap. Hydrophilic absorbent plus a Nomo polymer cover that evaporates water into the surrounding air, with a hydrophobic bacterial filter protecting the analyzer.1 |
| Connection | Direct connection to the ISA analyzer. No Luer adapter and no multi-patient adapter required.2 |
| Reuse | Single patient use.2 Do not attempt to sterilize by autoclave, irradiation, steam, gas, ethylene oxide, or any other method.2 |
| Latex | Not made with natural rubber latex2 |
| Regulatory Status | Prescription device. See the Regulatory and Shipping section below. |
| Pack Size | 25 per box |
| Related Part Numbers | 3817 adult nasal without O2; 3821 pediatric nasal with O2; 4624 adult nasal with O2 on a 4 meter line; 3824 adult nasal/oral with O2; 3814 adult/pediatric airway adapter set for intubated patients1 |
| Maximum Use Time | Masimo's directions for use describe the NomoLine sampling lines as single patient use products with a maximum of 14 days of use. Follow the directions for use and your agency's policy. Contact us if you need a written duration statement from Masimo for a bid or an infection control file. |
Complete the Monitoring Setup
This cannula covers the spontaneously breathing adult on a Masimo ISA analyzer. Here is what Pacific Biomedical carries around it.
- Same patient, oxygenation side: Masimo 1863 LNCS DCI Adult SpO2 Sensor (ventilation and oxygenation on the same Masimo platform, which is the pairing the clinical section above is really about)
- Mainstream instead of sidestream: Masimo 9632 EMMA Capnometer Kit and its EMMA Airway Adapters. EMMA is a standalone mainstream capnometer that measures in the airway using its own adapter, so it does not use a NomoLine sampling line. Different architecture, different consumable.
- Running a non-Masimo monitor? AirLife Adult EtCO2/O2 Filtered Cannula, 25/Box is the equivalent nasal cannula for platforms that do not take a NomoLine. Do not mix brands on one analyzer; use the sampling line the monitor manufacturer specifies.
- Intubated patient on a non-Masimo monitor: AirLife Adult/Pediatric Filtered EtCO2 Line with ETT Adapter, 6 ft. For an intubated patient on a Masimo ISA, the correct part is the NomoLine LH Adult/Pediatric Airway Adapter Set, 25/box (3814).
What's Included
- 25 Masimo NomoLine LH Adult Nasal CO2 Cannulas with O2 delivery (item 3820)
- Each cannula is a single-patient-use nasal interface on an integrated 2 meter sampling line with a hydrophobic bacterial filter and a direct ISA connector
- Integrated oxygen supply tubing with a star-shaped lumen
- No water trap, adapter, or separate filter to buy; nothing else is required between the cannula and a Masimo ISA analyzer
- Pediatric (3821), 4 meter (4624), nasal/oral (3824), and intubated airway adapter (3814) configurations are made by Masimo.
Who Uses This
Ground EMS & Ambulance
Altered mental status, overdose, respiratory distress, and post-sedation transports where the patient is on oxygen and breathing on their own, and the crew needs ventilation data, not just a saturation number.
Critical Care & Interfacility Transport
Long moves on a Masimo ISA-equipped monitor where nobody wants to be draining a water trap in the back of a truck or replacing a fouled sampling line mid-transport.
Emergency Department & Procedural Sedation
Non-intubated patients under moderate sedation on supplemental oxygen, the exact population where capnography catches what oximetry reports late.
Biomed & Materials Management
Standardizing the consumable that feeds the Masimo ISA analyzers already in the fleet, on a part number with a published flow rate, response time, and directions for use.
Frequently Asked Questions
What is an EtCO2 nasal cannula, and what is capnography on a nasal cannula used for?
Does supplemental oxygen through the cannula change the EtCO2 reading, and what flow rate should I use?
What is the difference between NomoLine LH and HH sampling lines?
What can cause an inaccurate capnography reading with a sampling line?
Which monitors does this NomoLine work with, and will it fit a ZOLL Zenix?
Is it single use, and can it be cleaned or sterilized?
Is this a prescription device, and how many come in a box?
Is this an authentic Masimo product?
How fast does this ship?
How do I place an order, request a quote, or set up an account?
References
- Masimo Corporation. NomoLine cannulas and airway adapter sets. Accessed August 21, 2026. https://www.masimo.com/products/sensors/nomoline/airway-adapters/
- Masimo Corporation. NomoLine airway adapter sets and cannulas: directions for use. LAB-9841A-eIFU. Accessed August 21, 2026. https://techdocs.masimo.com/globalassets/techdocs/pdf/lab-9841a-eifu.pdf
- Masimo Corporation. NomoLine ISA CO2 sidestream gas analyzer operator's manual. LAB-10152A. Accessed August 21, 2026. https://techdocs.masimo.com/globalassets/techdocs/pdf/lab-10152a_master.pdf
- Lightdale JR, Goldmann DA, Feldman HA, Newburg AR, DiNardo JA, Fox VL. Microstream capnography improves patient monitoring during moderate sedation: a randomized, controlled trial. Pediatrics. 2006;117(6):e1170-e1178. doi:10.1542/peds.2005-1709
- Cacho G, Perez-Calle JL, Barbado A, Lledo JL, Ojea R, Fernandez-Rodriguez CM. Capnography is superior to pulse oximetry for the detection of respiratory depression during colonoscopy. Rev Esp Enferm Dig. 2010;102(2):86-89. doi:10.4321/s1130-01082010000200003
- ZOLL Medical Corporation. Zenix EMS operator's guide. 9650-000421-06. Accessed August 21, 2026. https://www.zoll.com/-/media/product-materials/product-manuals/zenix/06/9650-000421-06-sf_b.ashx
- Masimo Corporation. Masimo capnography and multi-gas monitoring. Whitepaper PLM-14382A. Accessed August 21, 2026. https://www.masimo.com/siteassets/us/documents/pdf/plm-14382a-whitepaper-masimo-infrared-spectrometry-global.pdf
Peer-reviewed citations located via PubMed. This information supports product education and does not replace your agency's protocols, medical direction, or the manufacturer's Instructions for Use.
Authorized Masimo Distributor (USA). Genuine, factory-fresh product in original manufacturer packaging.
This legend appears in both the NomoLine directions for use and the NomoLine ISA CO2 operator's manual.2,3
Single patient use. Not made with natural rubber latex. Do not attempt to sterilize by autoclave, irradiation, steam, gas, ethylene oxide, or any other method.2 Use the device according to the manufacturer's Instructions for Use and your agency's protocols and medical direction.
In-stock orders typically ship within one business day. For current lead times, expedited options, or bulk orders, contact us at CustomerService@pacificbiomedical.com or 844.436.3526.
Order the Masimo NomoLine LH Adult Nasal CO2 Cannula with O2, 25/box
Genuine Masimo Corporation product, item 3820. Volume, GPO, and agency pricing available.
844.436.3526
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NomoLine LH Adult Nasal CO2 Cannula with O2, 25/box MAS-3820 |
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$297.00 25-bx
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