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Cystine, Urine Quant

Centralized Core Laboratory : Chemistry

Test ID/Workstation :
Specimen Type:
Tube Type:
Urine container
Collection Volume:
4.0 mL (minimum 3.0 mL) from a 24 hour urine collection
Cause for Rejection:
Refrigerated or ambient specimens.
Frozen critical
Sent to reference lab, days performed Monday-Friday
Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS)
Special Instructions:
Aliquot from a well-mixed 24 hr. urine collection in a container without preservatives or other acids. Instruct patient on 24 hour urine collection. To begin the urine collection, have the patient void. DISCARD THIS URINE SPECIMEN. This is best done with the first morning specimen. Note the time and record on the requisition. From then on collect all the urine that is voided and place in container. If more than one container is needed, please mark the first as #1 of 2 and retain on the floor until the collection is complete. The final void should be made 24 hours after the first void described earlier. The specimen should be included with the collection. Sample must be refrigerated during collection. Patient must abstain from Vitamin C ingestion 48 hours prior to collection. Provide clinical information along with age, gender, diet, drug therapy, and family history.
4-8 days
Additional Info:
Reference range is available on patient report
CPT Code:
Panel Includes:
Cystine, Urine; Cystine, Urine mg/dL; Cystine, 24 Urine; Creatinine, Urine mg/dL