Test Overview
Test Methodology

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Test Usage

Evaluation of cystinuria.

Reference Range *

CYSTINE: 3-15 years: 11 - 53 mcmol/24 hours; >=16 years: 28 - 115 µmol/24 hours. LYSINE: 3-15 years: 19 - 140 mcmol/24 hours; >=16 years: 32 - 290 mcmol/24 hours. ORNITHINE: 3-15 years: 3 - 16 mcmol/24 hours; >=16 years: 5 - 70 mcmol/24 hours. ARGININE: 3-15 years: 10 - 25 mcmol/24 hours; >=16 years: 13 - 64 mcmol/24 hours.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Friday
Analytic Time

4 - 6 days

Soft Order Code
CYSQN
MiChart Code
Cystinuria Profile, 24 HR Urine
Synonyms
  • Arginine, Quantitative, Urine
  • Cystine, Quantitative, Urine
  • Lysine, Quantitative, Urine
  • Ornithine, Quantitative, Urine
Laboratory
Sendout
Reference Laboratory
Mayo CYSQN (8376)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect 24 hour urine. Add 20 ml toluene as a preservative at the start of collection or refrigerate during collection and send frozen. Record total 24 hour urine volume and collection dates/times on request form.

Normal Volume
5 mL aliquot from 24 hour urine collection.
Minimum Volume
1 mL aliquot from 24 hour urine collection.
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
82136
Fee Code
20463
NY State Approved
No