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Test Code OXA24 / 003970-LC OXALATE, 24-HOUR URINE

Additional Codes

Software Test Code
Label Text                                   OXA24
EPIC LAB421
Lab Corp                                003970                                                   

Performing Laboratory

Laboratory Corporation of America (LabCorp)

Useful For

Working up nephrolithiasis

Method Name

Enzymatic Activity

Reference Values

CHILDREN
<7 years: not established

7-14 years: 13-38 mg/24h

 

ADULTS
Male: 7-44 mg/24h
Female: 4-31 mg/24h

Days and Times Test Performed

Monday through Friday

Report Available

2 Days

Specimen Type

Urine, 24-Hour

Preferred Container

24-Hour Urine Container – 30.0 mL 6N HCL preservative

Preferred Volume

Urine, 24-Hour: 10 mL (24-Hour Urine Container)

Minimum Volume

Urine, 24-Hour: 2.5 mL (24-Hour Urine Container)

Specimen Collection and Handling

1. Add 30 mL of 6N HCl at the end of the collection within 4 hours of completing collection.

2. Patient must avoid vitamin C supplements and vitamin C rich foods (e.g., citrus fruits like oranges, orange juice; vegetables like broccoli, tomatoes, peppers, potatoes) for 48 hours prior to collection.

3. Send at ambient temperature.

To Process:

1. Mix well and record 24-hour volume prior to aliquoting.

2. Measure pH. Desire pH is ≤3. Adjust, if necessary, using 6N HCl.

3. Send at ambient temperature.

4. 24-hour urine volume is required on request form for processing.

Click here to view the Urine Aliquoting Guide for Processing

Specimen Stability Information

Specimen Type: Urine, 24-Hour

Frozen: 14 Days

Refrigerated: 7 Days

Room Temp: 7 Days

Note: Stable x3 freeze/thaw cycles

Add On Capable

Contact Reference Lab – If add-on can never be done, report the test to the Administrative Analyst

Advance Beneficiary Notice Requirements

No ABN Required

CPT Code Information

CPT Code

CPT Description

CPT Disclaimer
83945 Oxalate, Quantitative  

Keywords

OXALIC ACID

Performing Laboratory Location

Laboratory Corporation of America (LabCorp)

Clinical Significance

Patients who form calcium oxalate kidney stones appear to absorb and excrete a higher portion of dietary oxalate in urine than do normal patients. Hyperoxaluria is not uncommon in subjects with malabsorption. Twenty-four hour urine collections for oxalate are indicated in patients with surgical loss of distal small intestine, especially those with Crohn’s disease. The incidence of nephrolithiasis in patients who have inflammatory bowel disease is 2.6% to 10%.1 Hyperoxaluria is regularly present after jejunoileal bypass for morbid obesity; such patients may develop nephrolithiasis. Used to work up nephrolithiasis.