About spirometry

What is spirometry?

Nowadays more and more people are diagnosed with respiratory diseases mostly because of smoking and poor air quality, especially in big cities. The most dangerous diseases are chronic obstructive pulmonary disease (COPD), which kills 3 million people a year and asthma with an annual death toll of 365000. Currently more than 344 million people suffer from asthma. Improving environmental conditions alone will not be enough to prevent the development of respiratory illnesses, early diagnosis can prevent or delay their development. Spirometry is the best way to diagnose lung diseases and it can be used to monitor lung health over time so we can act before lung function begins to deteriorate.

What is spirometry?

Spirometers analyze lung functions by measuring the rate of airflow and lung vital capacity. Several parameters can be calculated from spirometry test which are related to lung health and capacity.

Spirometry results are usually visualized by pneumotachographs. These charts plot the volume and airflow of the lung from one inhalation to exhalation. Several tests are being used but the most frequently used is FVC test which means forced volume vital capacity. The patient takes the deepest breath they can and exhales into the spirometer as hard and as long as possible.

Using these results doctors can recommend a treatment and improve patients’ life.

What is spirometry 1

Types of spirometers

There are several types of spirometers. Uscom’s PureFlow technology uses ultrasonic sensors in its spirometers which is the best method as you can see below.

Ultrasonic spirometer

Ultrasonic spirometers provide non-invasive measurements by using ultrasonic sensors to measure the transit time of ultrasonic pulses (known as time-of-flight measurement). Several studies proved that they are accurate, stable and not too sensitive to environmental conditions such as temperature, humidity and pressure, these effects can easily be compensated by software.

Their low flow resistance is well suited to measure lung functions of children, elderly and sick patients.

Peak-flow meter

These kind of spirometers only measure the peak expiratory flow (PEF) which is used to determine whether there is an obstruction in the airways by measuring how fast can the patient forcefully exhale after a full inhalation.

Their usage is limited because they cannot measure other parameters, so they are incapable of diagnosing complex diseases.

Turbine spirometer

Turbine flow meters contain turbine rotors and measures airflow by their spin speed. The speed is proportional to the velocity of the air.

Their flow resistance is higher which is suboptimal to children, elderly and sick patients. Operation costs are significantly higher because the turbine has to be replaced.

SpiroSonic ultrasonic spirometers provide a highly accurate, simple digital diagnosis and monitoring solution for all sufferers with lung disease.