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HelpTest Code LAB1945 Cystine, Urine, Timed Collection
Clinical System Name
Cystine, U 24 Qnt
Description
Quantitation of cystine by ion exchange chromatography
Sample Requirements
Specimen: Urine
Container(s): Sterile Screw-Capped Container
Preferred Vol: 24 hour collection
Minimum Vol: Timed collections other than 24 hr are acceptable.
Note:
Processing Instructions
Reject due to:
Spin:N
Aliquot:Y
Temp:-20 C
Storage location: -20 C BCG Box
SCHRMC/Off-site collection: Record total volume on requisition. Timed collections other than 24 hr are acceptable. Mix 24 hour jug well and freeze 10 mL aliquot. Ship frozen.
Stability
| Temperature | Time |
|---|---|
| Room temp | ≤ 2 hr |
| Refrigerated | < 2 hrs |
| Frozen | 1 month |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Biochemical Genetics
Phone Number: 206-987-2216
Synonyms
U24 Cystine
Availability
| STAT | Performed | TAT |
|---|---|---|
| N | M-F | 5 days |
Contact the Biochemical Genetics Lab for requests outside of stated availability (206)987-2216.
Methodology
Method: Ion exchange chromatography with post column derivatization
Analytical Volume: 10.0 mL
Limitations:
CPT Codes
82131
Requisition
Biochemical Genetics Requisition
On the requisition include clinical information needed for appropriate interpretation. (Age, gender, diet (e.g. TPN therapy), drug therapy and family history)
On the requisition record the total volume of urine collected.
Reference Ranges
| Newborn | 2 mo-1 year | 1 year-12 year | 12 year-adult |
| 9-14 umol/24 hr | 9-50 umol/24 hr | 21-50 umil/24 hr | 42-115 umol/24 hr |