Oxalate, Urine

Diagnostic Use

Oxalate was confirmed as a normal constituent of urine in 1851, but only recently has the significance of calcium oxalate crystals and its relationship to urinary tract stone formation been fully recognised.

An increased excretion of oxalate favours the formation of the very insoluble calcium oxalate in the urine, even if calcium excretion is normal. Formation of calcium oxalate in the urinary tract is considered the major cause in urinary calculi (kidney stone) formation.

An increased excretion of oxalate can be due to increased ingestion of oxalate rich foods, formation of oxalate due to metabolic defects such as hyperoxaluria (rare), and absorption of oxalate in a number of gastrointestinal disorders that produce severe fat malabsorption.


Lipids/Trace Metals

Delphic Registration Code


Laboratory Handling


Register for UOX


Take aliquot for UCRN for Core Lab if not frozen. Store Trace Metals freezer.


Samples must be acidified and 24 hour urine volume stated on sample and request form. Please confirm pH is less than 4 before sending to CHL. Store in freezer.

Turnaround Time

1 week

Test Code