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Laboratory Medicine

Test catalogue

Osmolality, Serum

Test Name

Osmolality, Serum

Gold Tube Specimen Type / Requirements

Container Type = 1 Gold Top (SST)

Minimum Volume = 1 ml serum

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Serum or heparinized plasma collected with or without gel separator. Write your initials, date and time of collection on the collection label or requisition.

Special Instructions Serum or heparinized plasma free from hemolysis collected with or without gel separator. Separate serum or plasma from cells within 2 hours of collection

Rejection Criteria: Unlabeled or samples of non sufficient quantity.

Stability: Stable for 1 week at 2-8°C.

Transportation: Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

Same Day

Test Utilization

Reference Value

Serum 280 – 300 mOsm/kg

Critical values: < 250mOsm/kg and > 330 mOsm /kg

Test Code

OSM

Methodology

Freezing-point depression osmometry

Testing Location

SMH-Biochemistry

Other Information

Last Updated: February 10, 2020