Test Code UOSM or LAB420 Osmolality, Urine
Specimen Requirements
Container Type: |
Sterile urine cup
*Urine may be random or timed. If the urine is from a timed collection, indicate the start and end times on the container. |
Optimal Collection Volume: |
5 mL |
Minimum Volume: |
1 mL |
Collection Instructions: |
1. Collect a random urine specimen from the patient. 2. Ensure the lid is secured tightly before sending it to the lab. 3. Ensure that no preservatives are used. |
Specimen Transport: |
Refrigerate |
Processing Instructions: |
1. Pour off urine into a labeled aliquot tube. 2. Centrifuge the urine aliquot. 3. Deliver the urine aliquot to the chemistry department. |
Specimen Stability
Specimen Type | Temperature | Time |
---|---|---|
Urine | Refrigerated | 7 days |
Room Temperature | 36 hours | |
Frozen | 30 days |
Specimen Rejection Criteria
Quantity not sufficient
Useful For
Assessing the kidney's ability to maintain both tonicity and water balance of extracellular fluid.
Methodology
Advanced Osmometer Model 3320 - Freeze point depression
Reference Ranges
300-1100 mOsm/kg
Day(s) Performed
24/7
Expected TAT
Same day
Performing Laboratory
Bronson Laboratory, Chemistry - Kalamazoo and Battle Creek
Sample Retention Time
7 days
CPT Code
83935
LOINC Code
2695-5