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Cystine Quantitative, Urine
MessageThis test is indicated only to monitor patients with cystinuria on therapy.
Test Code
4112
Preferred Specimen
24-hour or other timed urine collection. Avoid dilute urine when possible. Refrigerate 24-hour/timed specimens during collection.
Minimum Volume
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Instructions
Mix urine well. Transfer 8 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.
Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Specimen Stability
Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Refrigerated or room temperature specimens.
Methodology
Liquid Chromatography/Tandem Mass Spectrometry
Setup Schedule
Wed
Report Available
3-7 days
Limitations
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.
Clinical Significance
Use for monitoring treatment of patients previously diagnosed with cystinuria. To diagnose or rule out cystinuria, refer to Cystinuria Panel (0081105) or Amino Acids Quantitative, Urine (0080044).
