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Test and Tubes Database
ID:143 Osmolality
Search Links: General Info : Protocols : LabTestsOnline

DescriptionA measure of blood tonicity / concentration
IndicationAssessment of fluid and electrolyte balance.
Additional InfoPlease note: test can only be added to samples within 6 hours of collection (adults) OR within 2 hours of collection (paediatric)
Concurrent Testsna
Dietary Requirementsna
InterpretationIncreased in water depletion, hyperosmolar nonketotic diabetic coma, DKA, DI, increased calcium, alcohol. Decreased in adrenocorticoid insufficiency, water intoxication, SIADH.

TubeSerum or Heparin
Tube Picture
Collection ConditionsUse Gold top (serum gel) tube except for Intensive care units, renal unit, transplant unit, patients on IV heparin (use Green/yellow top tube for these patients).
Min. Vol1 mL

Ref. Range (Male)275 - 295
Ref. Range (Female) 275 - 295
Ref. Range (Paed)
Ref. Range Notes
IP Acute TATRefer to Website
IP Routine TATRefer to Website
GP Acute TAT- Contact Laboratory
GP Routine TATRefer to Website
Turnround CommentOsmolality analysis will only be treated as urgent if the lab is contacted, and in such instances will have a TAT of 3hrs

Originally edited by : MC. Review due on 10/04/2019 14:13:06. Published By S.Bennett on 10/04/2018 14:13:06.