Health

Plasma Osmolality Calculator

2×Na + glucose/18 + BUN/2.8.

Calculated Output

Osmolality (mOsm/kg) 290

Step-by-Step Breakdown

1. Values used:

2. Sodium = 140 mmol/L

3. Glucose = 90 mg/dL

4. BUN = 14 mg/dL

5. Osmolality = 290mOsm/kg

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Frequently Asked Questions

Measured vs calc?

The osmolar gap = measured − calculated (normally <10).