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Lab Manual for Moffitt-Long and Mount Zion

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Oxalic acid, 24 hour urine

Item Value
Approval req'd? No
Available Stat? No
Test code OXAU
Test group Oxalate
Performed by Quest
Sendout? Yes
Method Spectrophotometric, enzymatic
Patient Preparation Patient should refrain from eating chocolate, nuts, rhubarb, spinach, tea and vitamin C for 48 hours prior to collection.
Container type 24 hour urine collection container

Click here for Urine Preservative Requirements
Amount to Collect Entire 24 hour urine output
Sample type 24 hour urine collection
Preferred volume 10 mL urine
Min. Volume 2 mL urine
Processing notes Adjust pH to 2.0 - 3.0. Mix well before aliquoting. Refrigerate. For 24 hour urine order Quest # 5421N.
Units mg/24 h
Normal range 3.6-38 mg/24 h
Synonyms Oxalate
Turn around times Test run Monday-Friday Turnaround time: 2-5 days.
Additional information To convert mg/d to µmol/d (SI units) multiply by 11.4.

Urinary creatinine is assayed as a measure of the completeness of urine collection. If the total creatinine excretion is not within normal limits for the patient's age and sex (see entry for Creatinine) and the patient has normal renal function, the urine collection is probably incomplete and the result is invalid.
LOINC code 2701-1
Last Updated 5/23/2013 12:18:40 PM
Entry Number 701

If you have additional questions regarding this test, please call: 415-353-1667

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