Cystine, Urine Quant
Test Mnemonic
UCYSTD
CPT Codes
- 82131 - QTY (1)
Includes
- Creatinine, Urine (mg/dL)
- Cystine, 24 hour Urine (mg/d)
- Cystine, Urine Quant (umol/g CRT)
- Cystine, Urine (mg/dL)
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 4 mL | Urine, timed (well-mixed) | Clean container | Frozen, Critical | Avoid dilute urine when possible. Refrigerate 24-hour/timed specimens during collection. Mix well. Aliquot and freeze ASAP after collection; Clinical information needed with specimen. |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 4 mL | Urine, 24-hour (well-mixed) | Clean container | Frozen, Critical | Avoid dilute urine when possible. Refrigerate 24-hour/timed specimens during collection. Mix well. Aliquot and freeze ASAP after collection; Clinical information needed with specimen. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 3 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | Unacceptable |
| Refrigerated | Unacceptable |
| Frozen | 1 month |
Days Performed
Mon - Fri
Turnaround Time
4 - 8 days
Methodology
| Name | Description |
|---|---|
| Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) |
Reference Range
| Cystine, Urine Quant | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Months | 2 Months | Normal | < or = 870 | umol/g crt | 3 Months | 11 Months | Normal | < or = 300 | umol/g crt | 1 Years | 2 Years | Normal | < or = 150 | umol/g crt | 3 Years | 5 Years | Normal | < or = 125 | umol/g crt | 6 Years | 11 Years | Normal | < or = 100 | umol/g crt | 12 Years and older: < or = 150 umol/g crt |
Special Info
Critical Frozen. Refrigerated or ambient specimens will be rejected. Separate specimens must be submitted when multiple tests are ordered. Provide clinical information along with age, gender, diet, drug therapy and family history. This test is New York DOH approved.
Clinical Info
This test is indicated only to monitor cystinuria patients on therapy.