How to Choose an NDD Spirometer

Last updated Dec 20, 2023

Spirometry is the principal way of assessing lung functions as well as diagnosing and managing asthma, COPD, and occupational health risks, but choosing a diagnostic spirometer may be challenging. We have been fielding questions about the differences between ndd Medical Technologies’ EasyOne Air and Easy on-PC spirometers. Today, we’ll take the mystery out of choosing between the two.

Ultrasound Technology

But first, it’s important to point out that EasyOne Air and Easy on-PC spirometers rely on ultrasound technology, which ndd calls TrueFlow™, to measure volume and airflow. TrueFlow sends two ultrasonic signals diagonally across the flow path–one accelerates with the airflow while the other decelerates against it. By comparing the transit time difference between the signals, TrueFlow calculates airflow speed. This technology combines optimized transceiver cells generating the ultrasound signals with a high-speed digital time processor to measure transit times within nanoseconds.

Key Considerations When Choosing a Spirometer

When evaluating spirometers, first determine your needs regarding portability, connectivity, and data management. Handheld devices offer mobility for screening, while PC-based systems allow real-time data transfers to EMR platforms. If integrating with your records system, ensure the spirometer can connect directly or export compatible file types. Standalone spirometers require manual data offloading compared to network-enabled models.

Also consider the device’s language capabilities based on your patient population. Many spirometers offer multilingual platforms to ensure clear guidance and results interpretation. Review available languages and accessibility options to accommodate diverse user groups.

Mouthpieces, Flow Sensors and Filters

Long-term costs also depend on disposable components. Some spirometers use permanent ultrasonic sensors with disposable mouthpieces, while others require disposable or reusable turbine flow sensors. Disposable PFT filters also factor into recurring costs. Compare total cost of ownership when purchasing equipment.

Ease of use and training resources impact staff productivity. Devices with simple navigation, animations, and onboard help content minimize learning curves. Many manufacturers provide video tutorials and virtual training sessions when introducing new equipment.

Finally, assess after-sales support and maintenance options. Can in-house staff service devices or are external technicians required? Response time for repairs should align with clinical workflows. Extended warranties may suit busier practices.

By balancing clinical requirements, connectivity, usability, and budget, you can select the optimal spirometry solution for accurate, convenient lung function testing in your practice. Reputable manufacturers will support deployment every step of the way.

ndd EasyOne Air & Easy on-PC Spirometers

The EasyOne Air is the ultimate portable spirometer. Weighing just 12.6 oz, its compact size and long-lasting rechargeable battery were designed for mobility. The vibrant color screen provides real-time incentives to coach patients through testing. Bluetooth connectivity allows wireless printing and seamless data transfer to EasyOne Connect software. The automated ultrasonic TrueFlow sensor ensures precision and consistency. For flexibility across clinical settings, the EasyOne Air can’t be beat.

For advanced connectivity, the Easy on-PC system leverages the power of a desktop or a laptop computer. While remaining portable, the unit connects to a PC’s USB port to view results in real-time, network printouts, and integrate smoothly with EMR platforms. EasyOne Connect software can store all data centrally and enables remote quality control. For clinics needing a professional lab-grade system, the EasyOn-PC delivers.

While both provide the proven accuracy of ultrasonic TrueFlow, the EasyOne Air excels at fast field screening while the EasyOn-PC suits advanced lab integration.

EasyOne Filters FT and SP

The Covid-19 pandemic forced many countries to heighten infection control measures and require the use of an inline filter during spirometry maneuvers and advanced lung function tests. ndd Medical Technologies developed two filters: Filter SP to fit the Spirette mouthpiece for the Easy on-PC spirometer and Filter FT to fit the FlowTube mouthpiece for EasyOne Air.

In addition to their innovative design to reduce resistance to flow, ndd’s PFT filters are placed distally, at the end of mouthpiece, away from the patient. It is critical to update the firmware of the spirometer before using the filters, as ndd explains below.

Use Filter SP with Easy on-PC Spirometer

Use Filter FT with EasyOne Air Spirometer

ndd regularly publishes instructional guides as well as respiratory care updates on its multilingual YouTube channel.

Comparison Chart

The exhaustive comparison chart for the EasyOne Air and Easy on-PC spirometers should get you well on your way to choosing between two excellent choices. Please, note that both spirometers come with the EasyOne Connect software. 

Regulatory Compliance
Standards
Guidance
U.S.
Device Information
Dimensions
Weight
Operating Conditions
Power Supply
Supported EMR Standards
Data Management
Connectivity
Storage
Memory Card
Screen
Battery
Printing Options
Languages
Available languages
Measured Parameters
FVC
FVL
SVC
MVV
BTPS Correction
Pre-/Post-Challenge
Predicted Values
GLI
Canada & U.S.
Latin America
Europe
Scandinavia
Australia
South & East Asia
Africa
Flow-Volume Sensor
Type
Flow Range
Flow Resolution
Flow Accuracy (Except PEF)
Volume Resolution
Volume Accuracy
PEF Accuracy
MVV Accuracy
Resistance
Sampling Rate
Mouthpiece & Filters
Mouthpiece
Bacterial-Viral Filter
EasyOne Air Spirometer
ISO 13485, ISO 14971, IEC 62366, IEC 62304, ISO 26782, ISO 23747, IEC 60601-1, IEC 60601-1-2, ISO 10993-1
ATS / ERS 2019 Update, 2005 Standardization of Spirometry
FDA 510(k), NIOSH, OSHA, SSA Disability
3.4 x 6.1 x 1.4 in
12.6 oz
Temperature: 32–104 °F, Rel. Humidity: 5 - 90%, Pressure: 700–1060 hPa
5 VDC, Rechargeable 3.6 V battery
HL7, XML, GDT
EasyOne Connect included with spirometer. The standalone version requires Windows 10 or later, 1 GB for installation, up to 4 GB for storage. The server option requires Microsoft SQL Server 2014 or later with 8 GB for storage.
USB, Bluetooth
Up to 10,000 tests on device
SD Memory Card
Color touchscreen
About 100 sessions when fully charged. Approx. 5 hours to full charge.
Direct to printer or via EasyOne Connect software.
English, Danish, Dutch, French, German, Italian, Polish, Portuguese, Russian, Spanish, Swedish
ATI, BEV, EOTV, FEF10, FEF25, FEF25-75, FEF25-75_6, FEF40, FEF50, FEF50/FVC, FEF50/VCmax, FEF60, FEF75, FEF75-85, FEF80, FET, FET25-75, FEV.25, FEV.5, FEV.5/FVC, FEV.75, FEV.75/FEV6, FEV.75/FVC, FEV.75/VCmax, FEV1, FEV1/FEV6, FEV1/FVC, FEV1/FVC6, FEV1/VC, FEV1/VCmax, FEV3/FVC, FEV3/VCmax, FEV3, FEV6, FVC, MEF20, MEF25, MEF40, MEF50, MEF60, MEF75, MEF90, MMEF, MTC1, MTC2, MTC3, MTCR, PEF, PEFT, t0, VC, VCmax
ATI, BEV, CVI, E50/150, EOTV, FEF10. FEF25, FEF25-75, FEF25-75_6, FEF40, FEF50, FEF50/FVC, FEF50/VCmax, FEF60, FEF75, FEF75-85, FEF80, FET, FET25-75, FEV.25, FEV.5, FEV.5/FVC, FEV.75, FEV.75/FEV6, FEV.75/FVC, FEV.75/VCmax, FEV1, FEV1/FEV6, FEV1/FIV1, FEV1/FIVC, FEV1/FVC, FEV1/VC, FEV1/VCmax, FEV3/FVC, FEV3/VCmax, FEV3, FEV6, FIF25, FIF25-75, FIF50, FIF50/FEF50, FIF75, FIV.25, FIV.5, FIV1, FIVC, FVC, MEF20, MEF25, MEF40, MEF50, MEF60, MEF75, MEF90, MIF25, MIF50, MIF75, MMEF, MMIF, MTC1, MTC2, MTC3, MTCR, PEF, PEFT, PIF, t0, VC, VCmax
ERV, IC, IRV, Rf, VC, VCex, VCin, VCmax, VT
MVV, MVV6, MVVtime, Rf, VCext, VT
Yes
Yes
Quanjer 2012, Stanojevic 2009
Crapo 1981, Dockery (Harvard) 1993, Eigen 2001, Gutierrez (Canada) 2004, Hsu 1979, Knudson 1983, Knudson 1976, Morris 1971 & 1976, NHANES III (Hankinson) 1999, Polgar 1971
Chile 2010, Chile (Pediatrics) 1997, Pereira 1992, Pereira 2006/2008, Pérez-Padilla (PLATINO) 2006, Pérez-Padilla (Mexico) 2001, Pérez-Padilla (Mexico, Pediatrics) 2003
ERS (ECCS, EGKS, Quanjer) 1993, Garcia-Rio (SEPAR) 2013, Falaschetti 2004, Forche (Austria) 1988 & 1994, Klement (Russia) 1986, Roca (Spain, SEPAR) 1982, Rosenthal 1993, Sapaldia (Switzerland) 1996, Vilozni 2005, Zapletal 1977, Zapletal 2003
Berglund Birath (Sweden) 1963, Finnish 1982 (1998), Gulsvik (Norway) 1985, Hedenström 1985 & 1986, Langhammer(Norway) 2001, Kainu (Finland), 2016, Nystad 2002
Gore Crockett 1995, Hibbert 1989
Chhabra (India) 2014, Dejsomritrutai (Thailand) 2000, Indonesia 1992, IP (China, HongKong) 2000 & 2006, JRS 2001 & 2014
Mengesha (Ethiopia), 1985
Ultrasonic transit time
±16 L/s
4 mL/s
±2% or 0.020 L/s
1 mL
±2% or 0.050 L
±5% or 0.200 L/s
±5% or 5 L/min
0.3 cm H20 L/s at 16 L/s
400 Hz
Filter FT
Easy on-PC Spirometer
ISO 13485, ISO 14971, IEC 62366, IEC 62304, ISO 26782, ISO 23747, IEC 60601-1, IEC 60601-1-2, ISO 10993-1
ATS / ERS 2019 Update, 2005 Standardization of Spirometry
FDA 510(k), NIOSH, OSHA, SSA Disability
6 x 1 x 3 in
5.5 oz
Temperature: 32–104 °F, Rel. Humidity: 5 - 95%, Pressure: 620–1060 hPa
PC USB Port
HL7, XML, GDT
EasyOne Connect included with spirometer. The standalone version requires Windows 10 or later, 1 GB for installation, up to 4 GB for storage. The server option requires Microsoft SQL Server 2014 or later with 8 GB for storage.
USB only
Stores data on PC
N/A
N/A (connected PC monitor only)
Depends on PC USB port
Direct to printer or via EasyOne Connect software.
English, Brazilian Portuguese, Chinese, Croatian, Danish, Dutch, Finnish, French, German, Italian, Japanese, Norwegian, Portuguese, Russian, Spanish, Swedish, Turkish, Vietnamese
ATI, BEV, EOTV, FEF10, FEF25, FEF25-75, FEF25-75_6, FEF40, FEF50, FEF50/FVC, FEF50/VCmax, FEF60, FEF75, FEF75-85, FEF80, FET, FET25-75, FEV.25, FEV.5, FEV.5/FVC, FEV.75, FEV.75/FEV6, FEV.75/FVC, FEV.75/VCmax, FEV1, FEV1/FEV6, FEV1/FVC, FEV1/FVC6, FEV1/VC, FEV1/VCmax, FEV3/FVC, FEV3/VCmax, FEV3, FEV6, FVC, MEF20, MEF25, MEF40, MEF50, MEF60, MEF75, MEF90, MMEF, MTC1, MTC2, MTC3, MTCR, PEF, PEFT, t0, VC, VCmax
ATI, BEV, CVI, E50/150, EOTV, FEF10. FEF25, FEF25-75, FEF25-75_6, FEF40, FEF50, FEF50/FVC, FEF50/VCmax, FEF60, FEF75, FEF75-85, FEF80, FET, FET25-75, FEV.25, FEV.5, FEV.5/FVC, FEV.75, FEV.75/FEV6, FEV.75/FVC, FEV.75/VCmax, FEV1, FEV1/FEV6, FEV1/FIV1, FEV1/FIVC, FEV1/FVC, FEV1/VC, FEV1/VCmax, FEV3/FVC, FEV3/VCmax, FEV3, FEV6, FIF25, FIF25-75, FIF50, FIF50/FEF50, FIF75, FIV.25, FIV.5, FIV1, FIVC, FVC, MEF20, MEF25, MEF40, MEF50, MEF60, MEF75, MEF90, MIF25, MIF50, MIF75, MMEF, MMIF, MTC1, MTC2, MTC3, MTCR, PEF, PEFT, PIF, t0, VC, VCmax
ERV, IC, IRV, Rf, VC, VCex, VCin, VCmax, VT
MVV, MVV6, MVVtime, Rf, VCext, VT
Yes
Yes
Quanjer 2012, Stanojevic 2009
Crapo 1981, Dockery (Harvard) 1993, Eigen 2001, Gutierrez (Canada) 2004, Hsu 1979, Knudson 1983, Knudson 1976, Morris 1971 & 1976, NHANES III (Hankinson) 1999, Polgar 1971
Chile 2010, Chile (Pediatrics) 1997, Pereira 1992, Pereira 2006/2008, Pérez-Padilla (PLATINO) 2006, Pérez-Padilla (Mexico) 2001, Pérez-Padilla (Mexico, Pediatrics) 2003
ERS (ECCS, EGKS, Quanjer) 1993, Garcia-Rio (SEPAR) 2013, Falaschetti 2004, Forche (Austria) 1988 & 1994, Klement (Russia) 1986, Roca (Spain, SEPAR) 1982, Rosenthal 1993, Sapaldia (Switzerland) 1996, Vilozni 2005, Zapletal 1977, Zapletal 2003
Berglund Birath (Sweden) 1963, Finnish 1982 (1998), Gulsvik (Norway) 1985, Hedenström 1985 & 1986, Langhammer(Norway) 2001, Kainu (Finland), 2016, Nystad 2002
Gore Crockett 1995, Hibbert 1989
Chhabra (India) 2014, Dejsomritrutai (Thailand) 2000, Indonesia 1992, IP (China, HongKong) 2000 & 2006, JRS 2001 & 2014
Mengesha (Ethiopia), 1985
Ultrasonic transit time
±16 L/s
4 mL/s
±2% or 0.020 L/s
1 mL
±2% or 0.050 L
±5% or 0.200 L/s
±5% or 5 L/min
0.3 cm H20 L/s at 16 L/s
400 Hz
Filter SP

More questions?

We’ve answered the most common questions we get about the two ndd spirometers. If you have more questions, please, use the LiveChat box in the lower-right to send us a message, or fill out our contact form at any time. We’ll get back to you as soon as we can with an answer.

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