Osmolality

Osmolality tests measure the amount of certain substances in your blood, urine, or stool (poop). The tests can show how your kidneys are working and whether you have an unhealthy fluid balance.

Osmolality tests may be used for a variety of reasons.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

4 published ranges, each from a named source

275295 mOsm/kg H2O drawn: all ages · American Board of Internal Medicine (Laboratory Test Reference Ranges)

17 y+: 280–303 mOsm/kg
Normal: 275–295 mOsm/kg H2O
Normal: 275–295 mOsm/kg

Ranges from ARUP Laboratories Test Directory, American Board of Internal Medicine (Laboratory Test Reference Ranges), Mayo Clinic Laboratories (Test Catalog).

All source ranges (4)

Source	Sex	Age	Range
American Board of Internal Medicine (Laboratory Test Reference Ranges)	All	all ages	275–295 mOsm/kg H2O
ARUP Laboratories Test Directory	All	≤ 16 y	271–296 mOsm/kg
ARUP Laboratories Test Directory	All	17 y+	280–303 mOsm/kg
Mayo Clinic Laboratories (Test Catalog)	All	all ages	275–295 mOsm/kg

details

Sample: Serum or plasma · LOINC
Collection: Red top tube · 2 mL · Mayo Clinic Laboratories (Test Catalog)
Listed under: Dehydration · Diabetes Insipidus · Fluid and Electrolyte Balance
Code: LOINC 2692-2 · mOsm/kg H2O
Also known as: Observation, Osmo

See your own Osmolality Add a lab report and it is drawn against your lab's range, over time. Upload a Blood Test