Oxalate urine

Specimen:

24 h urine collected with HCl as preservative.

Method:

Chromatography, spectrophotometry.

Reference Interval:

Method dependent - consult pathologist.

Application:

Diagnosis of primary or secondary hyperoxaluria in patients with renal calculi.

Interpretation:

Elevation indicates hyperoxaluria, grossly increased levels occur in primary hyperoxaluria.

Very high levels are also seen in patients with ethylene glycol poisoning.

Reference:

Baker PW et al. Crit Rev Clin Lab Sci. 1996; 33: 39-82.