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Test Code OSMS Osmolality, Serum or plasma

Performing Laboratory

MaineGeneral Medical Center

Reference Values

275-295 mOsm/kg

 

Critical values (automatic call-back):  <250 mOsm/kg or >320 mOsm/kg

Specimen Requirements

Serum Osmo

Draw blood in a serum gel tube(s). For pediatric specimen, draw blood in a red-top MICROTAINER(S)®. Spin down and send 1 mL of serum refrigerated.

 

Plasma Osmo

Draw blood in lithium heparin tube(s) (green top)

 

Note:  Label specimen with patient’s name (first and last), date of birth, date and time of draw, and phlebotomist’s initials.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

83930