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OSMOLARITY(DHMC)STAT
MessageCHEMISTRY-DHMC
Test Code
OSMOLARITY(DHMC)STAT
Alias/See Also
OSMOLALITY
CPT Codes
83935
Preferred Specimen
PLASMA OR URINE OR BOTH ON SEPARATE ORDER NUMBERS
Minimum Volume
PLASMA: 2mLs, URINE: 1mL
Instructions
DRAW 1 LT GREEN LITH HEP TUBE, SPIN DOWN, AND SEND TO LAB. OR COLLECT RANDOM URINE SAMPLE WITH A STERILE CONTAINER PROVIDED BY PHYSICIAN'S OFFICE OR LAB AND SEND TO LAB.
Both Urine and Plasma may be collected but separate orders should be placed for each sample type.
Both Urine and Plasma may be collected but separate orders should be placed for each sample type.
Transport Container
PLASTICE TUBE/ STERILE CONTAINER
Transport Temperature
REFRIGERATED
Specimen Stability
PLASMA: Room temperature: 24 hours, Refrigerated (2-8°C): 24 hours URINE: Room temperature: 24 hours Refrigerated (2-8°C): 24 hours
Methodology
PLASMA/URINE: Freezing point measurement
Setup Schedule
DAILY
Report Available
Transfered to DHMC via Crosstown courier if STAT, or with Daily M-F Courier run. Results are completed DAILY.
Reference Range
PLASMA: 275- 295.0 mOsm/kg
URINE: 300 - 1000 mOsm.kg
URINE: 300 - 1000 mOsm.kg
Clinical Significance
Plasma osmolality is increased in hypernatremia, hyperglycemia, uremia, ethanol, methanol, or ethylene glycol overdoses, and in diabetes insipidus. URINE: This test is useful in the diagnosis and management of fluid and electrolyte disorders. Osmolality measures the moles of a nonelectrolyte substance dissolved per kilogram of pure water. Urine osmolality is a measure of solute concentration in the urine, and reflects the concentrating ability of the kidneys. The major factor modulating urine osmolality is vasopressin (antidiuretic hormone) and the urine-concentrating apparatus of the kidney, which responds to it.
Performing Laboratory
Dartmouth Hitchcock Medical Center-STAT
