UW Hospital and Clinics Lab Test Directory
| Test Name: |
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Osmolality
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| Test Code(s): |
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SOSM / GM2215
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| CPT Code(s): |
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83930
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| Methodology: |
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Freezing Point Osmometer
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: 1 hour.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Container: |
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Preferred: Red cap with yellow ring (SST)
Also Acceptable:
Green cap with yellow ring (PST),
Green top,
Red top
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| Collection Volume: |
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Preferred: 2 mL
Pediatrics: 1 mL
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| Sample Analyzed: |
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Serum or plasma
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| Volume Required: |
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Preferred: 1 mL
Pediatrics: 0.5 mL
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| Specimen Processing: |
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Centrifuge. If a complete barrier has not formed, transfer cell-free serum/plasma to plastic vial. Refrigerate.
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| Specimen Transport: |
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Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.
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| Stability: |
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Ambient: 48 hours
Refrigerated: 48 hours
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Interpretation
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Reference Interval:
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| Age: |
mOsm/kg |
| 0 days to 30 days |
266-298 |
| 31 days and up |
278-298 |
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