Oxalic Acid, Adult, Urine with Creatinine

Oxalate, Urine, Random

Test Codes

EPIC: LAB1232118, Beaker: OXALATE RU, Quest: 10456

Department

Send Outs

Instructions

Patient should refrain from taking excessive amounts of ascorbic acid or oxalate-rich foods (i.e. spinach, coffee, tea, chocolate, rhubarb) for at least 48 hours prior to the collection period.

Specimen Collection Criteria

Collect: 10.0 mL random urine in a screw-capped container (preferred) or other sterile collection container. (Minimum: 6.0 mL)

Physician Office/Draw Specimen Preparation

Maintain specimen refrigerated (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 10.0 mL random urine, refrigerated (2-8°C or 36-46°F). (Minimum: 2.0 mL)

Rejection Criteria

• Specimens not collected and processed as indicated.
• Specimens collected in metal-capped containers.

In-Lab Processing

Maintain specimen refrigerated (2-8°C or 36-46°F).

Add 2.0 mL 6N HCl per 100.0 mL urine.

Transport: 10.0 mL random urine, refrigerated (2-8°C or 36-46°F). (Minimum: 2.0 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 7 days
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 24 days

Specimen Storage in Department prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. 

Laboratory

Sent to Quest Diagnostics, Wood Dale, IL.

Performed

Information not available.

Reference Range

By report.

Test Methodology

Spectrophotometry (SP)

Interpretation

By report.

CPT Codes

83945 and 82570.

Contacts

Last Updated

12/17/2025