ARUP's Laboratory Test Directory

0081106: Cystine Quantitative, Urine

[ image for: Patient History For Biochemical Genetics]
Patient History For Biochemical Genetics
  

Test Mnemonic: QNT CYS U
Methodology: Ion Exchange Chromatography

Performed: Mon-Fri

Reported: 3-7 days

Specimen Required:  
Collect: 24-hour or other timed urine collections are also acceptable. Refrigerate 24-hour/timed specimens during collection.

Transport: 10 mL aliquot from a well-mixed random, 24-hour, or timed collection, frozen.  (Min: 3 mL) Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 3 mL aliquot from a well-mixed random urine, frozen.

Remarks: CRITICAL FROZEN.  As soon as possible after urine has been obtained, mix the collection well and freeze. Avoid dilute urine when possible. Clinical information is needed for appropriate interpretation.  Additional required information includes age, gender, diet (e.g., 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.  Record total volume and collection time interval on transport tube and test request form.

Unacceptable Conditions: Ambient or refrigerated specimens.

Stability: Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month

Reference Interval:
0-5 months: 62-345 µmol/g crt
6-11 months: 53-133 µmol/g crt
1-3 years: 53-186 µmol/g crt
4-12 years: 35-106 µmol/g crt
13 years and older: 27-151 µmol/g crt

Note:
This test is indicated only to monitor patients with cystinuria on therapy.

CPT Code(s):
82131