EBMcalc Medical Calculator

Water Deficit in Hypernatremia

Input

Age Sex Factor Male <65 years old (0.6) Male ≥65 years old (0.5) Female <18 years old (0.6) Female 18 to <65 years old (0.5) Female ≥65 years old (0.45)

Desired Na

Normal Weight

Serum Na

Result

Important: Inputs must be complete to perform calculation.

WDef

Decimal Precision

Data action

Include literature references: Yes No

Notes

The default unit of measure for weight is kilograms. Please verify that the correct unit of measure has been selected.
The term Age Sex Factor * Normal Weight represents the normal total body water (TBW).
Normal TBW is gender and age specific as seen in the 0.6, 0.5 and 0.45 factors above.

Equations used

WDef = (AgeSexFactor * NormalWeight) * (SerumNa - DesiredNa) / DesiredNa

Calculation details and variables

Equation parameters such as Age Sex Factor, have two or more discrete values that may be used in the calculation. The numbers in the parentheses, e.g. (0.6), represent the values that will be used.

References

Adrogue HJ, Madias NE. Hypernatremia. N Engl J Med. 2000 May 18;342(20):1493-9. PubMed ID: 10816188

Associated Medical Subject Headings [MeSH]

Female, Humans, Hypernatremia, Insensible, Male, Water Loss, Water-Electrolyte Imbalance

Associated Logical Observation Identifiers Names and Codes [LOINC]

Parameter	LOINC's and Suggested Units
Serum Na	2951-2 : mmol/L 2947-0 : mEq/L 32340-2 : mEq/L 39791-9 : mEq/L

This material contains content from LOINC (http://loinc.org). LOINC is copyright © 1995-2023, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license. LOINC® is a registered United States trademark of Regenstrief Institute, Inc.

Associated ICD10-CM codes

E87.0

Hyperosmolality and hypernatremia

E86.0

Dehydration

E87.8

Other disorders of electrolyte and fluid balance, not elsewhere classified

Associated ICD9-CM codes

276.0

Hypernatremia

276.51

Dehydration

276.9

Electrolyt/fluid dis nec

276.5

Hypovolemia

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