Clinics and Departments

Laboratory Services

Lab Dept:

Urine/Stool

Test Name:

CYSTINURIA PROFILE, QUANTITATIVE URINE

General Information

Lab Order Codes:

UCYQ

Synonyms:

Cystine, Quantitative urine

CPT Codes:

82136 – Amino acids, 2 to 5 amino acids, quantitative, each

Test Includes:

Cystine, Lysine, Ornithine, Arginine reported in mcmol/24 h.

Logistics

Test Indications:

Biochemical diagnosis and monitoring of cystinuria. Cystinuria is a disorder of the transport (intestine, kidney tubules) of four amino acids: cystine, lysine, arginine, and ornithine.

Lab Testing Sections:

Urine/Stool – Sendouts

Referred to:

Mayo Medical Laboratories (Test: 8376/CYSQN)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

3 - 5 days, test set up Monday - Friday

Special Instructions:

Collect before intravenous pyelogram.
Refrigerate or keep specimen on ice during the entire collection.
Note: Starting and ending times are required for a timed urine collection.

Specimen

Specimen Type:

Urine, 24 hour

Container:

Plastic leakproof container, 24 hour

Draw Volume:

5 mL (Minimum: 1 mL) urine from a 24 hour urine collection

Processed Volume:

Same as Draw Volume

Collection:

24 hour collection (required). Refrigerate or keep specimen on ice during the entire collection.

Special Processing:

Lab Staff: Mix 24 hour collection well. Measure 24 hour volume and note volume on specimen label. Remove a 5mL aliquot place into a 13 mL urine tube. Send specimen frozen. Forward promptly.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimens

Interpretive

Reference Range:

Cystine (mcmol/24 hours)

3 – 15 years:

11 – 53

> or = 16 years:

28 – 115

Lysine (mcmol/24 hours)

3 – 15 years:

19 – 140

> or = 16 years:

32 – 290

Ornithine (mcmol/24 hours)

3 – 15 years:

3 – 16

> or = 16 years:

5 – 70

Arginine (mcmol/24 hours)

3 – 15 years:

10 – 25

> or = 16 years:

13 – 66

Conversion formulas

mcmol/24 hours x 0.24 = result in mg/24 hours

mg/24 hours x4.17 = result in mcmol/24 hours

Critical Values:

N/A

Limitations:

N/A

Methodology:

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

References:

Mayo Medical Laboratories Web Page June 2013



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