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Spirometry Vs. Oscillometry

Modern healthcare relies on accurate, patient-friendly respiratory machines to assess lung function, diagnose disease early, and monitor treatment response. While spirometry has long been the standard respiratory machine used in pulmonary function labs, newer technologies such as AI-powered oscillometry are redefining how clinicians evaluate airway mechanics.

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Cut-off & Z-score

Not sure which reference method to use? Watch this short video breakdown to learn the key differences between Percentage Predicted, Z-Score, and Fixed Cut-Off Values

Antlia® Cut-off Values

Adults

Suggested cut-off values for Oscillometry by Dr Sundeep Salvi

Only for Adults (>18 years)

1 cmH₂O = 10.197 x kPa/L/s

• R5	4 cmH₂O/L/s
• R19	3 cmH₂O/L/s
• R5-R19	1 cmH₂O/L/s

• X5	-1 cmH₂O/L/s
• AX	4 cmH₂O/L
• Fres	12 Hz

Likely to be different for different devices.
As more and more data will emerge, these cut off values will become sharper

Pediatric

Reference Values for Respiratory Oscillometry Values

Pediatric Population

Age (years)	R5 (cmH₂O/L/s)	X5 (cmH₂O/L/s)	Fres (Hz)
3	14.2	-5.09	Up to 30
5	12.2	-3.56	22
6	10.12	—	—
10	7.13	-2.44	18
15	4.07	-1.0	14

Fres

(Heather Boas, Philadelphia, USA, 2022)

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