Free water deficit in hypernatremia

Current versionAcid-base / renal·3 inputs·2 references

Based on Yun G et al. (2023).

Pogosh offers this calculator when a case matches dehydration. It runs only when you press Calculate.

Decision support for clinicians — review before acting.

References

Yun G, Baek SH, Kim S. Evaluation and management of hypernatremia in adults: clinical perspectives. Korean J Intern Med. 2023;38:290-302. PMID 36578134; PMC10175862 (Eq. 5 and worked example). PubMed 36578134
Adrogué HJ, Madias NE. Hypernatremia. N Engl J Med. 2000;342:1493-1499. PMID 10816188. PubMed 10816188

Implementation notes

This is a review, not an original derivation; the formula is algebraic (sodium content held constant).

Related calculators

Anion gap (with albumin correction)Creatinine clearance (Cockcroft–Gault)Fractional excretion of sodium (FENa)Infusate rate for a target sodium change (Adrogué–Madias)Osmolal gap Calculated serum osmolality Expected serum sodium change from infusate and urine output Sodium corrected for hyperglycemia

Pogosh CDS reads a clinical note and offers the calculators that fit the case. Try it on your own note, browse all calculators, or call them from your software through the API.