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Test Code ROSM Osmolality in Urine

Specimen Type

Urine, random sample

Container

Urine, random

Preferred Volume

4 mL

UCMC Collection Instructions

Collect without additives.  Random or timed collection acceptable. 

Availability

24/7

Turnaround Time

3 hours

STAT Availability

Available

Test Usage

Useful in evaluating increased and decreased urine output

Test Methodology

Freezing point depression osmometry

Additional Information

Serum osmolality is often useful to interpret urine osmolality

CPT Code

83935

Test Includes

quantitative determination of osmolality in urine

Reference Range

500 – 800 mOsm/Kg

Critical Results

None

STAT Turnaround Time

1 hour

Minimum Volume

2 mL

Fee Code

43436