Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
24-hour or other timed urine collection. Avoid dilute urine when possible. Refrigerate 24-hour/timed specimens during collection.
Mix urine well. Transfer 4 mL aliquot urine to ARUP Standard Transport Tubes and freeze immediately. (Min: 3 mL) Record total volume and collection time interval on transport tube and test request form.
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Refrigerated or room temperature specimens.
Clinical information is needed for appropriate interpretation. Additional required information includes age, gender, diet (eg, TPN therapy), drug therapy, and family history. Biochemical Genetics Patient History Form is available on the ARUP Web site or by contacting ARUP Client Services.
Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month
Effective November 18, 2019
|Cystine, Urine - Quantitative||
Compliance Statement B: For laboratory developed tests not using a RUO kit, and for FDA approved, cleared or 510(k) exempt assays with alterations. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.
This test is indicated only to monitor patients with cystinuria on therapy.
|Component Test Code*||Component Chart Name||LOINC|
|0081107||Cystine, Urine - Quantitative||56677-8|
|0081219||Cystine, 24 Hour Urine||2179-0|
|0081220||Cystine, Urine - per volume||32169-5|
- Urine cystine