Medical calculators
Osmolality
Calculated Serum Osm
For education. Check every result.
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How it is calculated
Calculated Osm = 2×Na + Glucose/18 + BUN/2.8, with glucose and BUN in mg/dL - divide by those factors only in those units. Normal: 280-295. All three values are required: this deliberately will not substitute a normal glucose or urea for a blank field, because the osmolar gap this feeds is usually being calculated precisely when one of them is abnormal.
About
Serum osmolality calculated from sodium, glucose and urea, for comparison with a measured value.
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