Osmolality, Urine

Test Overview

Test Methodology

Freezing Point

Test Usage

To aid in evaluation of water balance and kidney function.

Reference Range *

300 - 1300 mOsm/kg for random specimens

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Set Up

Daily, 24 hours

Analytic Time

2 hours

Soft Order Code

OSMOU

MiChart Code

Osmolality, Urine

Synonyms

OSMOLALITY, URINE
OSMOU

Laboratory

Chemical Pathology

Section

Automation

STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

Specimen Requirements

Collection Instructions

Collect 24 hour urine specimen with no preservative. Aliquot 2 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Random urine is also acceptable.

Normal Volume

2 mL aliquot of random or 24 hour urine collection

Minimum Volume

0.5 mL aliquot of random or 24 hour urine collection

Rejection Criteria

Specimens collected with Acid Preservative are not acceptable.

Billing

CPT Code

83935

Fee Code

20741

LOINC

2695-5