OXALATE URINE

General Information

HLAB/HOL Code: OX
UPHSM LIS Test #: 027100
Schedule:
Testing Time: 4-5 Days
Testing Lab: Labcorp

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 10.0 mL
Temperature: Ambient
Tube Type: Urine - 24 hr urine
Collection Info:
Minimum Volume: 2.5 mL aliquot (Note: This volume does not allow for repeat testing.)
Container: Plastic  24-hour urine container with 30 mL 6N HCl preservative.
Collection: Instruct patient to void at 8 AM (or 8 PM) and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM [or 8 PM] the following day). Label container with patient's name and date and time collection started and finished. Measure and record total urine volume. Mix well. pH must be ≤3. Preservative not necessary during collection but should be added to urine collection within 24 hours.

Specimen Acceptability

Cause for Rejection:
Urine sample received with a pH not less than or equal to 3 from a patient on high doses of vitamin C.

Methods

Enzymatic

Clinical Utilities

Patients who form calcium oxalate kidney stones appear to absorb and excrete a higher portion of dietary oxalate in urine than do normals. 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.

CPT Codes

83945

* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Reference Range