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26065 Oxalate, Pediatric, Random Urine (ROXU)

Oxalate, Pediatric, Random Urine (ROXU)
Test Code: OX-CRSO
Synonyms/Keywords
​Hyperoxaluria
Oxalate
Useful For

Monitoring therapy for kidney stones.

Identifying increased urinary oxalate as a risk factor for stone formation.

Diagnosis of primary or secondary hyperoxaluria.

A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this random test is offered for children <16 years old.

Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ ​Urine, Random ​Plastic, 10 mL Urine Tube ​ ​7 mL ​6 mL ​
Collection Processing Instructions

1. Collect a random urine specimen.

2. No preservative.

3. Specimen pH should be between 4.5 and 8 and will stay in this range if kept refrigerated. Specimens with pH >8 may indicate bacterial contamination, and testing will be cancelled. Do not attempt to adjust pH as it will adversely affect results.

Additional Information:

1. A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this random test is offered for children <16 years old.

2. Avoid taking large doses (>2 g orally/24 hours) of vitamin C prior to specimen collection.

Specimen Stability Information
Specimen Type Temperature Time
​Urine ​ ​Refrigerate (preferred) ​14 days
​Frozen ​14 days
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
​Mayo Medical Laboratories ​Monday through Saturday ​5 days ​Enzymatic Using Oxalate Oxidasing
Reference Lab
Mayo Clinic Laboratories
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​83945 ​ ​ ​ ​
Synonyms/Keywords
​Hyperoxaluria
Oxalate
Ordering Applications
Ordering Application Description
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ ​Urine, Random ​Plastic, 10 mL Urine Tube ​ ​7 mL ​6 mL ​
Collection Processing

1. Collect a random urine specimen.

2. No preservative.

3. Specimen pH should be between 4.5 and 8 and will stay in this range if kept refrigerated. Specimens with pH >8 may indicate bacterial contamination, and testing will be cancelled. Do not attempt to adjust pH as it will adversely affect results.

Additional Information:

1. A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this random test is offered for children <16 years old.

2. Avoid taking large doses (>2 g orally/24 hours) of vitamin C prior to specimen collection.

Specimen Stability Information
Specimen Type Temperature Time
​Urine ​ ​Refrigerate (preferred) ​14 days
​Frozen ​14 days
Useful For

Monitoring therapy for kidney stones.

Identifying increased urinary oxalate as a risk factor for stone formation.

Diagnosis of primary or secondary hyperoxaluria.

A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this random test is offered for children <16 years old.

For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
​Mayo Medical Laboratories ​Monday through Saturday ​5 days ​Enzymatic Using Oxalate Oxidasing
Reference Lab
Mayo Clinic Laboratories
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​83945 ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.