Nephrology · Internal Medicine · ICU and Critical Care

Sodium Deficit in Hyponatremia calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Body weight

Allowed range: 66.14–440.92 lb

Female (1=yes)

0/1

Allowed range: 0–1 0/1

Current sodium

mmol/L

Allowed range: 100–135 mmol/L

Desired sodium

mmol/L

Allowed range: 120–140 mmol/L

Result

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Clinical inputs

Body weight (kg)Accepted range: 30 to 200
Female (1=yes) (0/1)Accepted range: 0 to 1
Current sodium (mEq/L)Accepted range: 100 to 135
Desired sodium (mEq/L)Accepted range: 120 to 140

Primary source

Adrogue HJ, Madias NE. Hyponatremia. N Engl J Med. DOI: 10.1056/NEJM200005253422107. PMID: 10824078. Scope: Na deficit ≈ TBW × (desired Na - current Na); TBW ≈ 0.6×wt (men) or 0.5×wt (women). (2000)

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