vital capacity
Definition
Noun: - The maximum volume of air a person can expel from the lungs after a maximum inhalation. It is a standard measurement in respiratory physiology, typically obtained using a spirometer, and serves as an important indicator of lung function and the health of lung tissue.
Usage
- Vital capacity is a key metric in assessing pulmonary health.
- It is measured during pulmonary function tests to help diagnose and monitor conditions like asthma, chronic obstructive pulmonary disease (COPD), or pulmonary fibrosis.
- The value can be influenced by factors such as age, sex, height, and physical fitness.
Examples
- The doctor ordered a spirometry test to measure the patient's vital capacity.
- Regular exercise can help maintain a healthy vital capacity.
- A significant reduction in vital capacity may indicate restrictive lung disease.
Advanced Usage
- Forced Vital Capacity (FVC): A closely related measurement where the exhalation is performed as forcefully and quickly as possible. This is the standard parameter reported in spirometry tests.
- The FVC, a type of vital capacity measurement, is crucial for diagnosing obstructive lung disorders.
Variants and Related Words
- Spirometry (n): The test process used to measure vital capacity and other lung volumes.
- Forced Expiratory Volume (FEV1) (n): The volume of air exhaled in the first second of the FVC test, often analyzed in conjunction with vital capacity.
- Total Lung Capacity (n): The total volume of air the lungs can hold, which includes the vital capacity plus the residual volume (air that cannot be exhaled).
Synonyms
- Lung capacity (in a general, non-technical context)
- Respiratory capacity
Notes on Meaning
This term is specific to medical and physiological contexts. While "capacity" alone has broader meanings, "vital capacity" refers exclusively to this precise respiratory measurement. It does not refer to a general ability or skill.
Noun
-
the maximum amount of air that can be exhaled after a maximum inhalation (usually tested with a spirometer); used to determine the condition of lung tissue
