IOS spirometry

Find spirometric and airway resistance diagnostics in one compact device

Tidal breathing analysis with impulse oscillometry (IOS) has demonstrated to be informative and differentiated in the early detection and follow-up of pulmonary diseases like asthma, COPD and idiopathic pulmonary fibrosis. Therefore, IOS oscillometric airway measurements complement spirometry.

Large patient range

Almost independent of patient cooperation, IOS can test a larger patient age range than spirometry alone.

Early detection

It helps detect pulmonary obstruction early, measuring impedance indicative of central and peripheral airway resistance.

Airway assessment

The device can assess and differentiate airway function under quiet breathing conditions.

Stand-alone or integrated design

IOS can be used alone or integrated with the Vmax® or MasterScreen™ product lines.

SentrySuite® software

It textually guides technologists during the test and helps automatically classify and interpret test results.

Bronchial provocation monitoring

The device provides the objective response of an airway tone to drug therapy even when FEV1 cannot.

IOS spirometry
Flow/Volume measurements
Type: Pneumotach
Range: 0–±20 L/s
Resolution: 10 mL/s
Accuracy: 0.1–14 L/s ±5% or 0.2 L/s (whichever is greater) or
0.2–12 L/s: ±2% or L/s (whichever is greater)
Resistance: < 0.05 kPa/L/s (0.5 cmH2O/L/s) at 10 L/s
CMRR: 60 dB at 50 Hz
Type: Pneumotach
Range: ± 20 L
Accuracy: 0.5–8 L: ± 3% or ± 0.05 L (whichever is greater)
Range: 1 mL


Mouth pressure (PM)
Type: Piezo resistive
Range: ± 2 kPa (±15 mmHg)
Accuracy: ± 2%
Resolution: 0.003 kPa (0.023 mmHg)
CMRR: 60 db at 50 Hz
Test signal
Type: Impulse of alternating direction
Pulse interval: 0.1–6 sec
Impulse length: 45 ms
Frequency range of single impulse: 0–100 Hz
Power spectrum: -20 dB at 40 Hz
Reference impedance: 0.2 kPa/(L/s) (2 cmH2O/(L/s))
Accuracy: < ± 2%

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