ICU Equations Cheat Sheet

Supportive Care & Reference · ICU Decoded chapter 89 · Locked — free with a referral

By Dr Javed Akhtar · Last reviewed 3 October 2026

Cited to Reference.

Key points

Must-know calculations: A-a gradient, PaO₂/FiO₂ ratio, anion gap with delta ratio, osmolal gap, corrected calcium, MELD/MELD-Na.
Reach for the Parkland formula (burns), corrected sodium (hyperglycemia), and Winter's formula (expected PaCO₂).
CKD-EPI 2021 eGFR (race-free) is preferred for GFR estimation; Cockcroft-Gault still guides drug dosing; APACHE/SOFA scores.
Keep units consistent; calculators aid, the exam is truth.

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