Skip to main content

Specimen Collection Manual and Test Catalog

  or
  or
  or

OXALIC ACID, 24-HOUR URINE WITHOUT CREATININE

Geisinger Epic Procedure Code:  LAB2795    Geisinger Epic ID:  17721

SPECIMEN COLLECTION
Specimen type: 

24-hour urine collection


Preferred collection container: 
Specimen required: 

10 mL aliquot of 24-hour urine, as above; minimum volume 2 mL.


Special notes: 

Mix well. Estimate total collection volume from 24-hour urine container. Remove required aliquot. Record total volume on both aliquot tube and request slip (if applicable).


Patient preparation: 

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 before collection.



SPECIMEN PROCESSING
Processing instructions: 

Adjust pH to less than 3.0 before aliquotting for testing. Mix well and aliquot 10 mL.


Transport temperature: 

Refrigerated (preferred). Refrigerated or frozen specimen also acceptable.


Specimen stability: 

Room Temperature: 6 days. Refrigerated: 7 days. Frozen: 4 months.


Rejection criteria: 

Stability limits exceeded.



TEST DETAILS
Reference interval: 

24-Hr Urine: 3.6-38.0 mg/24 hr
Random, Timed (not 24-Hr) Urine: Reference ranges are not available.


CPT code(s):  83945
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.

Test includes: 

Oxalic acid, 24-hour urine.


Methodology: 
Spectrophotometric (Colorimetric)
Synonyms: 

240XAL, Oxalic acid, 24-hour; Ethanedioate, Quest test code 11318


Clinical significance: 

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.


Review Date:  11/14/2024

Performing Locations