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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		mEq/L mmol/L
Normal Weight		gm kg lb
Serum Na		mEq/L mmol/L

 
Result
 
Important: Inputs must be complete to perform calculation.

 

WDef		L cL mL ounce (UK) ounce (US) pint (UK) pint (US) quart (UK) quart (US) tablespoon (US) tablespoon (metric) teaspoon (US) teaspoon (metric)
Decimal Precision   0 1 2 3

 

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

1. 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

 
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