F1 stands for forced expiatory volume in the first second and refers to the amount of air a person can forcefully exhale in 1 second after taking a deep breath it is an essential parameter measured during pulmonary function testing we created this video to cover the medical definition and provide a brief overview of the topic so if you're ready let's get into it the value of F1 is primarily used to assess the presence and severity of pulmonary diseases including asthma and COPD the procedure for fev1 is simple and non-invasive the patient takes a deep breath and then blows out as hard and fast as they can into a device called a spirometer the spirometer then records the total volume of air exhaled and the rate at which it is expelled the fev1 is the volume measured within the first second of this Forest exhalation in a healthy individual a large percentage of the lung's total capacity is expelled within the first second however in patients with obstructive lung diseases like asthma or COPD Airway obstruction reduces the speed and volume of air that can be exhaled as a result a smaller percentage of the total lung volume is expelled in the first second leading to A reduced fe1 F1 is commonly interpreted in conjunction with another spirometry measurement known as the forced vital capacity this is the total amount of air that can be forcefully exhaled after taking the deepest breath possible the ratio of F1 to fvc provides valuable diagnostic information in healthy adults the fv1 to fvc ratio is typically above 70% and a ratio below 70% is indicative of Airway obstruction suggestive of conditions like COPD it is important to note that F1 values are not absolute they are often compared to predicted normal values based on the patient's height age sex and ethnicity as these factors can influence lung volume and capacity in Respiratory Care an F1 score of less than 80% of the predicted value generally suggest a lung disease monitoring fv1 overtime allows healthc care providers to evaluate the progression of pulmonary diseases and the effectiveness of treatments for instance in patients with asthma an improved F1 following inhaler use can confirm the responsiveness to the treatment however while F1 is a valuable measurement it does not provide a comprehensive picture of lung Health on its own it is one aspect of a complete pulmonary function test which may include other measures such as total lung capacity and gas exchange efficiency but as you can see F1 is a vital tool in the assessment and monitoring of pulmonary diseases it offers significant insights into the extent of Airway obstruction and response to treatment and although it's just one component of pulmonary function testing F1 plays a critical role in guiding the diagnosis treatment and management of various respiratory conditions if you want to support the Channel please like And subscribe I would greatly appreciate it and there should be some other helpful videos popping up on your screen right about now that I think you will enjoy and just a quick reminder we are not doctors this video is for informational purposes only thank you so much for watching have a blessed day and as always breath easy my friend