health.spirometry-predicted-fev1 Calculator
Calculates predicted FEV₁ (Forced Expiratory Volume in 1 second) from height, age, and sex using NHANES III reference equations, and classifies obstruction severity. FEV₁/FVC below 0.7 confirms airflow obstruction; FEV₁% predicted below 80% indicates moderate–severe COPD.
Inputs
- Age Years
- Age in completed years. Many health and fitness formulas adjust for age.
- Height Cm
- Vertical measurement. For health calculators, typically standing height without shoes.
- Sex
- Reference formula or conversion factor shown for context.
- Fev1 Measured L
- Reference formula or conversion factor shown for context.
- Fvc Measured L
- Reference formula or conversion factor shown for context.
Results
- FEV1 % predicted
- Reference formula or conversion factor shown for context.
- FEV1/FVC ratio
- The proportional relationship between two quantities.
- predicted FEV1 (L)
- Reference formula or conversion factor shown for context.
- GOLD obstruction
- Sample size or count used in the calculation.
- GOLD severity (if obstructed)
- Reference formula or conversion factor shown for context.
- restrictive pattern
- The pattern or structure identified in the data.
height predicted spirometry ratio health