August 2025 – Critical Care Info

PHYScalc: Blood Gas Calculator

First try at a combined blood gas and Stewart method calculator. I’m not entirely happy with it, but refinements will come soon. Stewart Method Acid–Base Calculator Strong Ion Difference (SID), Effective Strong Ion Difference (SIDe), Strong Ion Gap (SIG), Partial pressure of carbon dioxide (PaCO₂), Total concentration of weak acids (ATOT). pH PaCO₂ kPa mmHg […]

PHYScalc: PF Ratio

P/F Ratio (PaO₂/FiO₂) – CC-OrangeCard PaO₂/FiO₂ (P/F) Ratio Calculator PaO₂ mmHg = 10.7 kPa PaO₂ (alt) kPa = 80 mmHg FiO₂ % = 0.40 P/F (mmHg) mmHg P/F (kPa) kPa Severity Normal oxygenation Normal: > 300 mmHg (> 40 kPa) Mild ARDS: 200–300 mmHg (26.7–40 kPa) Moderate ARDS: 100–200 mmHg (13.3–26.7 kPa) Severe ARDS: <= […]

PHYScalc: Gas tension

Gas Pressure Converter 100 mmHg = 13.33 kPa = 136 cmH2O Pressure (mmHg)