Laboratory Test Information Guide

Details for Osmolality,Urine/Serum/Plasma

Test Name: Osmolality,Urine/Serum/Plasma
Alternate Name(s):  
Laboratory: Core
Specimen Type: Random urine collected in a sterile container
or
5 mL Gold or 4.5 mL Green top Vacutainer

Pediatric:

0-2 years: 1 mL Red Microtainer
2-10 years: 2 mL Red top tube
Collection Information: Collect urine sample in a sterile container.

Collect blood aseptically in a Vacutainer tube.

A minimum volume of 1 mL is required for testing.

Requisition: GENERAL LABORATORY REQUISITION
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
 
Routine
2 hours
Stat
1 hour
 
Reference Range: Urine:
300-900 mOsm/Kg

Serum/Plasma:
275-295 mOsm/Kg
Effective Date:  
Revised Date: 2021-03-17
Critical Value:  
Interpretive Comments: Useful in suspected poisoning with alchol, methanol, ethylene glycol, acetone, isopropanol, diethyl ether or paraldehyde.

Comparing serum and urine osmolalities may help to determine the cause fo polyuria, to diagnose SIADH and to distinguish 'pre-renal' from 'renal'causes of impaired renal function.
Special Processing:  
Comments:  
Method of Analysis: Freezing point depression.
Advanced Micro Osmometer 3320 (@SJH) and Advanced Instruments A2O Automated Osmometer (@UH/VH).
Critical Information Required:  
Storage & Shipment:  
System Codes: 
Cerner
OSMU / OSMS
 
Referred To:  

Questions? Comments? Contact Laura Gopaul