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Oxalate, Urine

Mnemonic:    [U OXALATE]
Name:    Oxalate, Urine
Specimen:    4 mL aliquot from a 24 hour urine collection. Preservation of the aliquot with Sulfamic Acid before transporting is highly recommended.
Minimum Spec:    1.5 mL
Transport Temp:    FREEZE
Ref Lab/Code:    ARUP 0020482
  Method:    Spectrophotometry
Note:    Patient Preparation Note: Vitamin C (ascorbic acid) quickly degrades to oxalate in non-acidified urine. Patients should discontinue use of vitamin C supplements at least 48 hours prior to the start of urine collection and abstain until collection is complete.

Refrigerate sample during collection and deliver to the laboratory immediately upon completion of the collection.
Processing Info:    Thoroughly mix the 24 hour collection in one container. Transfer 4 mL aliquot from the well-mixed 24-hour urine collection to an ARUP Transport Tube containing 20 mg Sulfamic Acid (ARUP supply #48098) available online through eSupply using ARUP Connect.

Preservation with Sulfamic Acid before transporting is highly recommended. Alternative samples handling is listed on the ARUP online test catalog.

Before transmitting the ARUP packing list, SR TIME and SR VOLUME must be verified.

Collection instructions for a 24 hour urine sample