4 - 6 days
Test Updated:
Arginine, Quantitative, Urine
Cystine, Quantitative, Urine
Lysine, Quantitative, Urine
Ornithine, Quantitative, Urine
CQN-ARGIN
CQN-LYSINE
CQN-ORNITH
CQN-QUAL
CQN-QUANT
CYSTINE-Q
ARGININE
LYSINE
ORNITHINE
QUALITATIVE CYSTINE
QUANTITATIVE CYSTINE
Looking to order a test?
We’ve provided helpful links to make ordering easy.
Find a RequisitionAll specimens should be accompanied by a requisition.
Submitting SpecimensLearn about how to properly label and where to ship specimens.
Order Kits and SuppliesMLabs provides all the supplies necessary for the collection of specimens.
Test FAQVisit our provider FAQ and learn about common questions to ordering tests.
Test Overview
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.
Specimen Requirements
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.