What Is the FOT Test?
The FOT test, or Forced Oscillation Technique test, works by sending small pressure oscillations into the airways during normal, relaxed breathing. Unlike spirometry, which requires patients to forcibly exhale as hard as possible, the FOT test measures airway resistance and reactance passively — without any special breathing maneuvers. This makes it a genuinely patient-friendly option, especially for children, elderly individuals, or anyone who is physically too weak to perform a traditional spirometry test.
The science behind the FOT test is well-established. Research published in leading respiratory journals has demonstrated that oscillometry can detect small-airway abnormalities that spirometry often misses — making it not just easier, but in many cases more sensitive as a diagnostic tool.
Antlia Pro®: Bringing the FOT Test to the Clinic
Developed by iCaltech Innovations Pvt. Ltd., a Bengaluru-based MedTech company, Antlia Pro® is an AI-powered, non-invasive device that delivers the FOT test through a simple, intuitive PC interface. The device is designed with a passive-cooperation design philosophy — the patient simply breathes normally into the device, and Antlia Pro® does the rest.
The Antlia Pro® FOT test measures key parameters including:
- Impedance (Z), Resistance (R), and Reactance (X) — to map the mechanical behavior of the airways
- Resonant Frequency (Fres) and Area of Reactance (Ax) — to identify peripheral airway involvement
- Tidal volume, breathing time, and respiratory rate — for a complete respiratory snapshot
Clear graphical outputs display R5 and X5 loops, resistance and reactance across multiple frequencies, and pre/post-intervention comparisons, giving clinicians actionable data at their fingertips.
Who Benefits Most From the FOT Test?
One of the biggest advantages of the FOT test via Antlia Pro® is its versatility. The device supports diagnosis and monitoring across a wide range of patient profiles:
Pediatricians love it because children as young as 3–4 years can perform the FOT test with minimal guidance — no forced breathing required. Dr. Narayan Prasad Modi, Professor of Paediatrics (M.D., FIAP), noted that Antlia Pro® could “revolutionise the way we diagnose asthma in children.”
Pulmonologists rely on it to track small-airway disease progression with precision. Dr. Mitesh Kakkad, an allergist with over two years of clinical experience using the device, highlighted how Antlia Pro® offers a “deeper understanding of respiratory system and lung parenchyma.”
General Practitioners now have a reliable, in-clinic FOT test tool that enables early detection of obstructive airway disease before symptoms become severe.
Respiratory Therapists and Researchers also benefit from the device’s reproducible measurements and AI-powered analysis engine, which ensures consistent reporting across patient groups.
The Future of Respiratory Diagnostics
The global push toward patient-centric healthcare is accelerating. The FOT test aligns perfectly with this direction — it is fast, comfortable, and diagnostically rich. As respiratory disease burdens grow worldwide, tools that make the FOT test accessible in OPDs, pediatric clinics, and research settings will be critical.
Antlia Pro® by iCaltech Innovations is at the forefront of this shift. If you are a clinician looking to offer a better diagnostic experience, or a researcher seeking precise, reproducible airway mechanics data, the FOT test with Antlia Pro® deserves serious attention.
To explore the device or schedule a demonstration, visit icaltech.com.