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24 Σεπ 2024 · The normal value for negative inspiratory force (NIF) is greater than -20 cmH2O, indicating good respiratory muscle strength. The normal value range for vital capacity (VC) is typically 65–75 mL/kg.
15 Αυγ 2023 · The calculation for inspiratory capacity is the tidal volume (the amount of air you casually breathe in) plus the inspiratory reserve volume (the amount of air you forcefully breathe in after a normal inhalation). This equation is written as: TV + IRV = IC.
Interpreting results. Best of 3 consistent readings (FEV1 & FVC) Borderline normal results - repeat in few months to confirm diagnosis (especially > 75 years) Abnormality detected if any of following recorded: FEV1 <80% predicted normal. FVC <80% predicted normal.
The lung capacity calculator determines all the respiratory capacities: Vital capacity (VC); Inspiratory capacity (IC); Functional residual capacity (FRC); Total lung capacity (TLC). based on inspiratory, tidal, expiratory reserve and residual volume that have been measured through spirometry.
Doctors usually calculate the reference values on the basis of these parameters and use them as reference for the test results. A result is considered normal if the value falls over 80% of the predicted score, while lower percentages are indicators of respiratory issues. FVC, Forced Vital Capacity
Inspiratory Capacity (IC): The volume of air that is inhaled into the lung during a maximal forced inspiration effort that begins at the end of a normal tidal expiration (VT+IRV=3L). Vital Capacity (VC): The volume of air that is expelled from the lung during a maximal forced expiration effort starting after a maximal forced inspiration (4.5L).
When determined via spirometry, normal average values for inspiratory capacity are 3.5 L for men and 2.4 L for women. IC offers information about the volume of air that can be inhaled, during normal and forced inspiration.
