Cystinuria Profile, Quantitative, 24 Hour, Urine
Use
Provides a biochemical diagnosis of cystinuria through measurement of cystine, lysine, ornithine, and arginine in a 24‑hour urine collection; useful in patients with suspected cystinuria for evaluation of renal excretion of dibasic amino acids ([mayocliniclabs.com](https://www.mayocliniclabs.com/test-catalog/Overview/8376?utm_source=openai)).
Special Instructions
Not provided.
Limitations
Test was developed and validated by Mayo Clinic Labs under CLIA but is not FDA cleared or approved. No significant cautionary statements noted ([mayocliniclabs.com](https://www.mayocliniclabs.com/test-catalog/Overview/8376?utm_source=openai)).
New York Approved
Methodology
Mass Spectrometry (LC-MS/MS)
Biomarkers
LOINC Codes
- 90785-7 - Cystinuria Pnl 24h Ur
- 13362-9 - Specimen collect Time Ur
- 3167-4 - Specimen vol 24h Ur
- 13966-7 - Cystine 24h Ur-sRate
- 25464-9 - Lysine 24h Ur-sRate
- 25491-2 - Ornithine 24h Ur-sRate
- 25322-9 - Arginine 24h Ur-sRate
Result Turnaround Time
3-5 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
5 mL aliquot from 24‑hour urine
Minimum Volume
1 mL
Container
Urine Tubes, 10 mL (T068)
Collection Instructions
Collect before intravenous pyelogram; add 5 g diazolidinyl urea (Germall) at start of collection (if unavailable, refrigerate during collection); collect for 24 hours; mix well before taking 5 mL aliquot
Stability Requirements
| Temperature | Period |
|---|---|
| Refrigerated | 14 days |
| Frozen | 70 days |