Pulmonology Calculators
Tools for pulmonary function assessment and arterial blood gas analysis.
Available Calculators
Explore our collection of specialized calculators
What are Pulmonology Calculators?
Pulmonology calculators are specialized clinical instruments that assist pulmonologists, intensivists, and attending physicians in pulmonary function assessment, spirometry interpretation, and analysis of respiratory disorders. They enable calculation of Tiffeneau index (FEV1/FVC), lung capacity assessment, arterial blood gas interpretation, and severity stratification of respiratory diseases. Based on guidelines from the Brazilian Society of Pulmonology and Tisiology (SBPT), international pulmonary function protocols, and validated reference values, these calculators are essential for diagnosing COPD, asthma, restrictive diseases, and monitoring chronic lung disease progression.
When to Use These Tools
- Interpretation of spirometry results
- Differential diagnosis between obstructive and restrictive patterns
- Assessment of COPD and asthma severity
- Arterial blood gas analysis in respiratory failure
- Monitoring evolution of chronic pulmonary diseases
- Preoperative pulmonary function assessment
Clinical Benefits
Frequently Asked Questions
What is Tiffeneau Index and how to interpret it?
Tiffeneau Index is the FEV1/FVC ratio (Forced Expiratory Volume in 1 second / Forced Vital Capacity). Value <0.70 (or <70%) indicates obstructive disorder. Normal values are generally >0.75-0.80. It is the main parameter for COPD diagnosis and differentiation between obstructive and restrictive patterns.
How to classify COPD severity?
GOLD classification uses post-bronchodilator FEV1: GOLD 1 (mild) ≥80%, GOLD 2 (moderate) 50-79%, GOLD 3 (severe) 30-49%, GOLD 4 (very severe) <30%. Combine with symptoms (mMRC or CAT) and exacerbations for ABCD classification and treatment guidance.
Does normal spirometry exclude lung disease?
No. Normal spirometry excludes significant ventilatory disorders, but not diseases such as pulmonary embolism, pneumonia, lung cancer, or early interstitial diseases. Spirometry assesses ventilatory function, not all pulmonary pathologies. Always correlate with clinical presentation and other tests.