Test Catalog

Test ID: CYSQN    
Cystinuria Profile, Quantitative, 24 Hour, Urine

Method Description Describes how the test is performed and provides a method-specific reference

Quantitative analysis of the amino acids (AA) cystine, lysine, arginine, and ornithine is performed by liquid chromatography-tandem mass spectrometry (LC-MS/MS) by labeling amino acids present in urine with aTRAQ Reagent 121. Samples are dried and reconstituted with aTRAQ Reagent 113-labeled Standard Mix. Amino acids are separated and detected by LC-MS/MS. The concentrations of amino acids are established by comparison of their ion intensity (121-labeled amino acids) to that of their respective internal standards (113-labeled amino acids). Chromatography is performed using a C18 (150x4.6mm) column and total analysis time is 18 minutes.(Lacey JM, Casetta B, Daniels SB, et al: Quantitation in plasma, urine and CSF by Itraq reagent amino acid analysis kit and MS-MS. J Am Soc Mass Spec 2008;19[5]:S97)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) Performed Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.

Monday through Friday

Report Available The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.

3 to 5 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

2 weeks

Performing Laboratory Location Indicates the location of the laboratory that performs the test