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Test Code:
OSMOLALITYU

Order Name:
Osmolality (Random Urine)

 
Useful For:
Assessing the concentrating and diluting ability of the kidney
 
Methodology:
Freezing Point Depression
 
 
 
Test Code:
OSMOLALITYU

Order Name:
Osmolality (Random Urine)

 
Collection Specimen Or Container:
Urine, Clean container
 
Specimen Testing Type:
Urine , minimum volume 10 mL
 
Sub Mission Container:
Clean container
 
Specimen Stabillity:
Specimen Type Temperature Time
Random Urine Refrigerated, 2oC to 8oC 7 days
Frozen, -20o 7 days
 
 
 
Test Code:
OSMOLALITYU

Order Name:
Osmolality (Random Urine)

 
Method detail:
Freezing Point Depression
 
Schedule:
Tested daily (24 hours)
 
Turnaround Time:
Collected specimen to report within 1.5 hours (90 mins)
 
Performing Location:
Chemistry, Laboratory Department Tel. 13224
 
Specimen Retention Time:
7 days
 
 
 
Test Code:
OSMOLALITYU

Order Name:
Osmolality (Random Urine)

 
 
Clinical Information:
Osmolality is an index of the solute concentration. Urine osmolality is a measure of the concentration of osmotically active particles, principally sodium, chloride, potassium, and urea; glucose can contribute significantly to the osmolality when present in substantial amounts in urine. Urinary osmolality corresponds to urine specific gravity in nondisease states.
The ability of the kidney to maintain both tonicity and water balance of the extracellular fluid can be evaluated by measuring the osmolality of the urine either routinely or under artificial conditions. More information concerning the state of renal water handling or abnormalities of urine dilution or concentration can be obtained if urinary osmolality is compared to serum osmolality and if urine electrolyte studies are performed. Normally, the ratio of urine osmolality to serum osmolality is 1.0 to 3.0, reflecting a wide range of urine osmolality.
 
Reference Value:
Age Referance Value Unit
0 - 11 months 50 - 750 mOsmo/kgH2O
Over or equal 12 months 150 - 1,150 mOsmo/kgH2O
 
Interpretation:
With normal fluid intake and normal diet, a patient will produce a urine of about 500 to 850 mosmol/kg water. Above age of 20 years there is an age dependent decline in the upper reference range of approximately 5 mOsm/kg/year.
The normal kidney can concentrate a urine to 800 to 1,400 mosmol/kg and with excess fluid intake, a minimal osmolality of 40 to 80 mosmol/kg can be obtained.
With dehydration, the urine osmolality should be 3 to 4 times the plasma osmolality.
 
Clinical Reference:
http://www.mayomedicallaboratories.com (Retrieved: 01 Jan 2019)