Specimen Collection
Quantitation: 2mL random or aliquot of a 24 h urine. For the 24 hour urine, keep cool during collection period.
Freeze sample if transport to laboratory is delayed
Reference Intervals
Quantitation: Reference Interval will be reported with results
Turnaround Time: 1 week, 3 days
Test is available urgently if required contact laboratory on x22016 or via LabLink
Diagnostic Use and Interpretation
Urine cystine quantitation is used for the diagnosis and monitoring of cystinuria. For cystinosis, see White Cell Cystine. Cystinuria is the result of defective transport of cystine and the dibasic amino acids lysine, arginine and ornithine through the epithelial brush border of the renal tubules and small intestine. Because of low cystine solubility patients present with urolithiasis and its complications. They are otherwise asymptomatic.
Contact Information
For further information contact laboratory: ext 22016 or via Lablink
or, contact the Metabolic Physician-on-call: 09 367 0000