Corrected Calcium / Sodium Suite
Corrected Calcium / Sodium Suite - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
Open the Corrected Calcium / Sodium Suite → Runs in your browser. No signup, no tracking.
What this is
Two bedside corrections in one tile. Payne's albumin-corrected calcium adjusts the measured total calcium for the patient's serum albumin (corrected Ca = measured Ca + 0.8 x (4.0 - albumin)), unmasking true hypo- or hypercalcemia when albumin is abnormal. Glucose-corrected sodium adjusts the measured sodium for hyperglycemia using either the classic Katz factor (1.6 mEq/L per 100 mg/dL glucose above 100) or the Hillier factor (2.4 mEq/L per 100 mg/dL above 100); Sophie Well returns both so you can compare them against the clinical picture.
When to use it
Reach for the calcium correction whenever a total calcium is reported on an inpatient whose albumin is not 4.0 - the corrected number is the right value to compare against the laboratory's reference range, and the right value to act on for symptomatic hypocalcemia workup. Reach for the sodium correction whenever you see a sodium and a glucose drawn together with the glucose above ~200 mg/dL (DKA, HHS, severe steroid-induced hyperglycemia); the corrected sodium tells you whether the apparent hyponatremia is real dilutional, pseudo-, or true. When in doubt, an ionized calcium and a recheck after glucose normalizes are still the gold standards.
References
Payne RB BMJ 1973 (Ca); Katz NEJM 1973 / Hillier Am J Med 1999 (Na).
Worked example: Corrected Ca 9.6 mg/dL; corrected Na (Katz) 138, (Hillier) 142.
Sophie Well is a reference and educational tool. Not medical, legal, or financial advice. Does not replace clinician judgment, professional billing review, or legal counsel.