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HelpTest Code LAB1123 Osmolality, Serum or Plasma
Additional Codes
| Test Name in EPIC | EPIC Test Code | Mnemonic |
|---|---|---|
| OSMOLALITY, SERUM | LAB1123 | OSMOS |
Methodology
Osmometer—Freezing Point Depression
Note: For in-house patients only. If a provider requests an osmolal gap, order test #LAB1123 Osmolality, Serum or Plasma, and comment that an osmolal gap be performed also. A dark-green top (lithium heparin) tube of whole blood must be drawn in addition to the serum tube.
Specimen Requirements
If serum osmolality is being performed in conjunction with urine osmolality, draw serum within 4 hours of urine collection.
Submit only 1 of the following specimens:
Preferred:
Specimen Type: Serum
Container/Tube: Serum gel
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.3 mL
Additional Information: Label specimen appropriately (serum).
Alternate:
Specimen Type: Plasma
Container/Tube: Light-green top (lithium heparin gel)
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.3 mL
Additional Information: Label specimen appropriately (plasma).
Specimen Transport Temperature
Refrigerate 5 days/Frozen 6 months OK/Ambient 4 hours OK
Day(s) Test Set Up
Monday through Sunday
Performing Laboratory
Chemistry-
SMDC Clinical Lab
Fargo Hospital Lab
Test Classification and CPT Coding
83930
Reference Values
280-300 mOSM/kg