Osmolality 

Description

Osmolality tests may be used for a variety of reasons. A blood osmolality test, also known as a serum osmolality test, is most often used to:

• Check the balance between water and certain chemicals in the blood. Find out if you have swallowed a poison such as antifreeze or rubbing alcohol
• Help diagnose dehydration, a condition in which your body loses too much fluid. Help diagnose overhydration, a condition in which your body retains too much fluid
• Help diagnose diabetes insipidus, a condition that affects the kidneys and can lead to dehydration