Oxalate (Blood)
Chemical Pathology
Notes
For the investigation of renal stone problems, 24 hour urine oxalate is the preferred investigation.
Plasma oxalate is only available for determining the efficacy of dialysis in patients with primary oxaluria who are on renal dialysis.
Please contact the duty biochemist first if you wish to request this test.
Sample requirements
For adults, blood taken into an 4mL EDTA tube
For children, blood taken into a 2mL EDTA tube
Storage/transport
Do not store. Blood must be sent immediately to the laboratory after venepuncture as plasma must be separated rapidly from cells.
Required information
Relevant clinical details including reason for the request, and whether pre- or post dialysis.
Turnaround times
Samples are sent for analysis to University College Hospital, London, with results expected back within 3 weeks.
Reference ranges
Less than 10 µmol/L
Further information
To learn more about oxalate visit Lab Tests Online or access the oxalate monograph of the Association for Clinical Biochemistry and Laboratory Medicine