Laboratory Medicine

Test catalogue

Oxalate, 24 H Urine \| Oxalic Acid, 24 H Urine
Test Name Oxalate, 24 H Urine \| Oxalic Acid, 24 H Urine Clinical Utility Monitoring therapy for kidney stones using 24-hour urine collections. Identifying increased urinary oxalate as a risk factor for stone formation. Diagnosis of primary or secondary hyperoxaluria.
Specimen Type / Requirements Container Type = 24 H Urine container with 25 mL 6N HCL. Minimum Testing Volume = 10 mL urine from mixed urine collection
Specimen Handling Collection Instructions: 24 Hour urine plain container. Specimen should be refrigerated during and after collection. 6N HCl. Laboratory Staff Instructions Acidify the 24H urine samples using with 6N hydrochloric acid (HCl). Acceptable pH is less than 2.0. Rejection Criteria: Leaking container or inappropriate container type. Transportation: Store and send cold.
Stability

Oxalate, 24 H Urine | Oxalic Acid, 24 H Urine

Oxalate, 24 H Urine | Oxalic Acid, 24 H Urine

Container Type = 24 H Urine container with 25 mL 6N HCL.

Minimum Testing Volume = 10 mL urine from mixed urine collection

Collection Instructions: 24 Hour urine plain container. Specimen should be refrigerated during and after collection. 6N HCl.

Laboratory Staff Instructions Acidify the 24H urine samples using with 6N hydrochloric acid (HCl). Acceptable pH is less than 2.0.

Rejection Criteria: Leaking container or inappropriate container type.

Transportation: Store and send cold.

Ambient (15 to 30°C)	Refrigerated (2 to 8°C)	Frozen -20°C or lower
- -	7 days	14 days

14 days

70 – 480 µmol/D

LAB421

Enzymatic

SMH-Biochemistry

Last Updated: Oct 23, 2026