4 - 6 days
Arginine, Quantitative, Urine
Cystine, Quantitative, Urine
Lysine, Quantitative, Urine
Ornithine, Quantitative, Urine
Looking to order a test?
We’ve provided helpful links to make ordering easy.Find a Requisition
All specimens should be accompanied by a requisition.Submitting Specimens
Learn about how to properly label and where to ship specimens.Order Kits and Supplies
MLabs provides all the supplies necessary for the collection of specimens.Test FAQ
Visit our provider FAQ and learn about common questions to ordering tests.
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Evaluation of cystinuria.
CYSTINE: 3-15 years: 11 - 53 mcmol/24 hours; >=16 years: 28 - 115 µmol/24 hours. LYSINE: 3-15 years: 19 - 140 mcmol/24 hours; >=16 years: 32 - 290 mcmol/24 hours. ORNITHINE: 3-15 years: 3 - 16 mcmol/24 hours; >=16 years: 5 - 70 mcmol/24 hours. ARGININE: 3-15 years: 10 - 25 mcmol/24 hours; >=16 years: 13 - 64 mcmol/24 hours.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect 24 hour urine. Add 20 ml toluene as a preservative at the start of collection or refrigerate during collection and send frozen. Record total 24 hour urine volume and collection dates/times on request form.