Clinical Reference
Evidence, formulas, and clinical context
More Respiratory Calculators
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A-a Gradient (Alveolar-arterial Gradient)
Assesses oxygenation efficiency and helps determine the cause of hypoxemia (e.g., V/Q mismatch vs. shunt vs. diffusion defect).
Bicarbonate Deficit Calculator
Helps guide bicarb replacement in metabolic acidosis — often used in ICU or renal overlap.
Alveolar Gas Equation
Calculates the expected alveolar oxygen (PAO₂) — helps inform A-a gradient and understand O₂ physiology.
Respiratory Compensation (Winter’s Formula)
Estimates expected respiratory compensation in metabolic acidosis — key in acid-base analysis.