Sodium Correction Rate (Change in serum Na per 1 L of infusate)

Sodium Correction Rate: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

Sodium Correction Rate

Body weightkg

Male sex (1 = yes)

Age ≥65 years (1 = yes)

Serum Nammol/L

Infusate Nammol/L

Infusate Kmmol/L

Change in serum Na per 1 L of infusate

14.3214mmol/L

Hyponatremia: no more than 10 mmol/L per 24 h (8 if high risk of osmotic demyelination)Na content: 0.9% NaCl 154; 3% NaCl 513; lactated Ringer's 130; 5% dextrose 0 mmol/LMonitor serum Na every 2–4 hSodium Correction Rate: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

Total body water

27.0L

Volume per 1 mmol/L Na change

70mL

What it shows

Health, fitness and clinical calculators with standard formulas — body composition, calories, blood pressure, lipid panels, cardiac scores (CHA₂DS₂-VASc, HEART, TIMI), kidney/liver function (MELD, Child-Pugh), pregnancy and more.

Formula & example

The calculator computes Change in serum Na per 1 L of infusate (mmol/L) from parameters:

Body weight (kg)
Male sex (1 = yes)
Age ≥65 years (1 = yes)
Serum Na (mmol/L)
Infusate Na (mmol/L)
Infusate K (mmol/L)

Example 1

Body weight = 60 kg, Male sex (1 = yes) = 0, Age ≥65 years (1 = yes) = 1, Serum Na = 112 mmol/L, Infusate Na = 513 mmol/L, Infusate K = 0 mmol/L

→ Change in serum Na per 1 L of infusate: 14.32 mmol/L

Example 2 (×1.5)

Body weight = 90 kg, Male sex (1 = yes) = 0, Age ≥65 years (1 = yes) = 1.5, Serum Na = 168 mmol/L, Infusate Na = 769.5 mmol/L, Infusate K = 0 mmol/L

→ Change in serum Na per 1 L of infusate: 14.49 mmol/L

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FAQ

How is BMI calculated?

BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.

Is BMI accurate for everyone?

No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.

What are the BMI categories?

Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.

What is a better measure than BMI?

Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.

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Sodium Correction Rate (Change in serum Na per 1 L of infusate)