Definition
What Osmolality measures
Serum osmolality measures how concentrated the blood is. In CIRS protocols it is ordered with ADH so the two can be read as a pair.
← All biomarkers
Innate immunityCompletemOsm/kg
Osmolality
The concentration of the blood, paired with ADH
Illustrative sample band · Synthetic
292mOsm/kg
273Sample target 280–300 mOsm/kg307
Why it matters
How clinicians usually read it
The pair is the point. A mailed chemistry sodium is not a substitute for a formal osmolality and a frozen ADH.
When it reads low
A lower value can mean
A lower osmolality means a more dilute serum. It is interpreted with ADH, sodium, and symptoms — not as a stand-alone target.
When it reads high
A higher value can mean
A higher osmolality means a more concentrated serum. Dehydration, a long fast, or an ADH mismatch can all live here.
Questions for a clinician
Bring the number into a real conversation
01
Does this osmolality match my ADH, or is the pair mismatched?
02
Could a simple fluid deficit explain it without a CIRS read?
03
When should we repeat the pair?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for Osmolality.