Cystine, Urine Quantitative
Label Mnemonic: CYSTU
Epic Lab Code: LAB387
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
356-8593
Specimen(s):
Urine (24 hr or random) More information
Specimen Instructions:
Refrigerate after random collection. Submit immediately to Specimen Control. 24 hr collections are accepted if refrigerated during collection and submission to Specimen Control.
Collection Medium:
Urine - 24 hour/timed plastic urine container
Minimum:
Preferred Minimum: 4 mL of well--mixed 24 hr or random urine collection
Absolute Minimum: 3 mL random urine collection
Delivery Instructions:
Deliver to laboratory immediately after collection. Critical frozen. Separate specimens must be submitted when multiple tests are ordered.
Turn Around Time:
3-7 days upon receipt at reference laboratory
Reference Range:
0-2 months: 14-573 μmol/g CRT
3-8 months: 28-461 μmol/g CRT
9 months-2 yr: 34-186 μmol/g CRT
3-12 yr: 26-98 μmol/g CRT
13 yr and older: 12-81 μmol/g CRT
Comments:
Screen for Cystine only. Deliver to Specimen Control 6240 RCP.

Please print, complete and submit the Patient History for Biochemical Genetic Testing form from ARUP to the lab with the specimen and the A-1a Miscellaneous Request.
Test Limitations:
This test is indicated only to monitor patients with cystinuria on therapy.
Methodology:
Liquid Chromatography/Tandem Mass Spectromoetry
CPT Code:
82131