This study is looking at how a breathing test called Oscillometry, using the tremoFlo C-100 Airwave Oscillometry System, relates to lung function and body size in people with breathing difficulties, decreased lung function, or asthma. Researchers want to see if the measurements from the Oscillometer are connected to abnormal results on a methacholine challenge test (a test to see how sensitive your airways are). You can join if you are 18 or older, can speak and understand English, are willing to do a breathing test, and have been referred for a methacholine challenge test. The study aims to understand if these measurements can help us learn more about airway resistance. The current recruitment status is unclear.

Study design

This is an observational study, meaning researchers will observe and collect information without giving any specific treatment. It plans to enroll 100 participants.

What's involved

You would need to perform a breathing test using the tremoFlo C-100 Airwave Oscillometry System. This measurement is taken once, around day 1.

Compensation

Not stated in the trial record.

Follow-up

The primary measurement is taken at a single time point, approximately day 1. No further follow-up is specified.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.