OSMOLALITY, SERUM

What this test checks

Measures how concentrated your blood is — useful in evaluating dehydration, certain poisonings, and unusual hormone problems.

Why do people get this test?

Used in hospital and specialist settings for puzzling fluid-balance problems.

When you should consider this test

• Severe dehydration evaluation
• Suspected poisoning
• Unusual hormone issues

How to prepare

No fasting needed.