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Test ID: Oxalate (24h urine)
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Oxalate (24h urine)
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Oxalate (24h urine)
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Useful For
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The investigation and monitoring of renal stone formers
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Method name and description
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Clinical information
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Oxalate is a poorly soluble anion and high concentrations of in the urine is a risk factor for the formation of renal calculi. A group of inherited diseases (primary hyperoxalurias) can result in elevated oxalate concentrations due to aberrant glyoxylate or glycerate metabolism.
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Specimen type / Specimen volume / Specimen container
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Specimen type: urine, 24 hours collection.
Specimen volume: total urine volume collected in 24 hours.
Specimen container: suitable 24 hours plain urine collection container/s.
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Collection instructions / Special Precautions / Timing of collection
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Avoid intake of oxalate rich food, like spinach, chocolate, rhubarb, or oxalate precursors such as vitamin C (Ascorbic Acid) for at least 48 hours before collection. Pyridoxine is said to diminish oxaluria. The patient should be on usual fluid and food intake.
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Relevant clinical information to be provided
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Presenting clinical signs and symptoms
Any relevant medications
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Storage and transport instructions
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Transport Temperature: 2 - 30 °C.
Storage Temperature: -20°C after add the preservative for upto 7 days.
The sample should not be thawed till analysis.
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Specimen Rejection Criteria
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Insufficient specimen quantity.
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Biological reference intervals and clinical decision values
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Factors affecting test performance and result interpretation
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High levels of ascorbate (vitamin C) can lead to artefactual increases in oxalate
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Turnaround time / Days and times test performed / Specimen retention time
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Turnaround time: 5 working days.
Days and times test performed: Once a week.
Specimen retention time: 7 days.
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