Yale New Haven Hospital

Department of Laboratory Medicine
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Oxalic acid, urine, random

Lab Section: 

Sendout Reference


Lab Location: 


Reference Lab: 



Test ID: 




Spectrophotometry (SP)


Tuesday, Thursday, Saturday


10 days

Specimen Requirements: 

Collection: 10.0 mL Urine in a Yellow Top Tube - Urine.
Pediatric volume: 2 mL.
Alternative specimens: No preservative Okay to add preservative after collection Other urine.
Please submit 10 mL of a well-mixed random collection. Adjust pH to < 3.0 with 6N HCl prior to aliquoting for testing. Refrigerate after collection.
Transport: Room temperature.
Handling: 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.
Stability: Room temperature: 6 days Refrigerated: 7 days Frozen: 4 months



Clinical Indications: Excessive oxalates in the urine may lead to oxalate kidney stones. Hyperoxaluria may be due to a rare inherited metabolic disorder in which the body produces excess of the salt oxalate leading to stone formation.

Performing lab: Quest Diagnostics Nichols Institute 33608 Ortega Highway San Juan Capistrano, CA 92675-2042

Reference Interval: 

See patient report or consult reference laboratory website.


CPT Code(s): 

83945, 82570

Last Changed: 

11/22/2016 11:07:30

Last Reviewed: 

8/29/2017 6:01:50