Laboratory Test Information Guide

Details for Osmolality, 24-Hour Urine

Test Name: Osmolality, 24-Hour Urine
Alternate Name(s):  
Laboratory: Core
Specimen Type: 24 Hour urine
Collection Information: Collection of 24-Hour Urine Sample

Collect urine over a 24 hour period as per container label instructions.

Keep refrigerated during collection period.

Please complete the laboratory label attached to the collection bottle to include patientís name, collection start time and date and collection end time and date.
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: 300-900 mosm/kg
Effective Date: 2006-05-16
Revised Date: 2019-02-21
Critical Value:  
Interpretive Comments: Useful to assess the concentrating and diluting ability of the kidney.

Comparing serum and urine osmolalities may helpto determine the cause of 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 Instrument Micro Osmometer.
Critical Information Required:  
Storage & Shipment:  
System Codes: 
Cerner
OSMU24
 
Referred To:  

Questions? Comments? Contact Laura Gopaul