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Free Water Deficit Calculator

kidney.wiki

Pediatric Free Water Deficit Calculator

Free Water Deficit Calculator

Approach to estimation
Method
Free water deficit (FWD) mL

Calculations must be re-checked and should not be used alone to guide patient care, nor should they substitute for clinical judgment. See our full terms of use.

We recommend using the kidney.wiki kidney length calculator

Issues with the kidney length nomogram (MrNomogram[1,2]):

Open our calculator Continue to MrNomogram

  1. Chen JJ, Zhi J, Mao W, Steinhardt GF. MrNomogram: a web-based multivariable pediatric renal nomogram. J Pediatr Urol. 2006;2(5):436-438.

    doi.org/10.1016/j.jpurol.2005.10.003 Pubmed ID 18947652

  2. Chen JJ, Pugach J, Patel M, Luisiri A, Steinhardt GF. The renal length nomogram: multivariable approach. J Urol. 2002;168(5):2149-2152.

    doi.org/10.1016/S0022-5347(05)64339-X Pubmed ID 12394745

  3. Vyas DA, Eisenstein LG, Jones DS. Hidden in plain sight: reconsidering the use of race correction in clinical algorithms. N Engl J Med. 2020;383(9):874-882.

    doi.org/10.1056/NEJMms2004740 Pubmed ID 32853499

  4. Horsfall LJ, Bondaronek P, Ive J, Poduval S. Clinical algorithms and the legacy of race-based correction: historical errors, contemporary revisions and equity-oriented methodologies for epidemiologists. Clin Epidemiol. 2025;17:647-662.

    doi.org/10.2147/CLEP.S527000 Pubmed ID 40673267