Phenytoin Correction (Albumin / CrCl)
Corrected ≈ measured ÷ ((0.2 × albumin g/dL) + 0.1) if CrCl ≥20; else ÷ ((0.1 × albumin) + 0.1) (teaching).
Calculator
How it works
Hypoalbuminemia and renal failure increase the unbound fraction of phenytoin; corrected totals help teaching discussions.
Limits
Does not replace free phenytoin assays, pharmacokinetic consultation, or drug interaction review.
Educational tool only—not for diagnosis or treatment decisions.