You are here
Home > Medical Calculator > Osmolality (serum ) Calculator

Osmolality Calculator

Osmolality = sodium x 2 + glucose/18 + bun/2.8 + Etoh/4.6
Normal range: 285-295 mOsm/kg

Osmolality of blood increases with dehydration and decreases with overhydration. In normal people, increased osmolality in the blood will stimulate secretion of antidiuretic hormone (ADH). This will result in increased water reabsorption, more concentrated urine, and less concentrated blood plasma. A low serum osmolality will suppress the release of ADH, resulting in decreased water reabsorption and more concentrated plasma.
Sodium: mEq/L
Glucose: mg/dL
Bun: mg/dL
Etoh (optional): mg/dL

Background:

Osmolality = sodium*2  +  glucose/18 +  bun/2.8 + Etoh/4.6

Disclaimer

The authors make no claims of the accuracy of the information contained herein; and these suggested doses are not a substitute for clinical judgment. Neither GlobalRPh Inc. nor any other party involved in the preparation of this program shall be liable for any special, consequential, or exemplary damages resulting in whole or part from any user’s use of or reliance upon this material.PLEASE READ THE DISCLAIMER CAREFULLY BEFORE ACCESSING OR USING THIS SITE. BY ACCESSING OR USING THIS SITE, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS SET FORTH IN THE DISCLAIMER. Read the disclaimer

< <