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Laboratory Test Directory

Osmolality

Components

Name Method Department Units
Osmolality Osmometer
Core Lab, Chemistry, Routine mosmol/kg

Specimen Requirements

Plasma Spun, Serum Spun

Container Type Container Size Specimen Volume
Preferred

Green tube (Lithium heparin), with Gel

3 mL 3 mL
Alternate

Green tube (Lithium heparin), No Gel

Micro sample tube 1 mL
Alternate

Green tube (Lithium heparin), No Gel

3 mL 3 mL
Alternate

Red tube, (no anticoagulant), No Gel

3 mL 3 mL
Alternate

Red tube, (no anticoagulant), No Gel

Micro sample tube 1 mL
Alternate

Green tube (Lithium heparin), with Gel

Micro sample tube 0.3 mL
Stability

Refrigerated - 2 day(s)

Specimen Preparation

  • Centrifuge, remove plasma/serum and refrigerate

Reasons for Rejection

  • Wrong collection tube

Comments

Osmolality is a measured result, while Osmolarity is calculated from Na, K, Glucose

CPT Code

  • 83930