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Test Code UCYSM Cystinuria Profile, Quantitative, 24 Hour, Urine

Additional Codes

 

MAYO Test ID

CYSQN

EPIC Test ID

LAB2111

 

Reporting Name

Cystinuria Profile, QN, 24 hour

Useful For

Diagnosis of cystinuria

Method Name

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

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Urine


Specimen Required


Container/Tube: Plastic, 10-mL urine tube (T068)

Specimen Volume: 5 mL

Collection Instructions:

1. Collect before intravenous pyelogram.

2. Collect urine for 24 hours.

3. Add 20 mL of toluene as preservative at start of collection. If toluene is not available, refrigerate during collection.

4. Mix well before taking 5-mL aliquot.

Additional Information:

1. 24-Hour volume is required.

2. See Urine Preservatives in Special Instructions for multiple collections.

Forms: New York Clients-Informed consent is required. Please document on the request form or electronic order that a copy is on file. An Informed Consent for Genetic Testing (T576) is available in Special Instructions.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Frozen 14 days

Reject Due To

Hemolysis

NA

Lipemia

NA

Icterus

NA

Other

>20 mL toluene added to 24 hour collection

Reference Values

CYSTINE

3-15 years: 11-53 mcmol/24 hours

≥16 years: 28-115 mcmol/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

 

Conversion Formulas:

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

Result in mg/24 hours x 4.17=result in mcmol/24 hours

Day(s) and Time(s) Performed

Monday through Friday; 8 a.m.

CPT Code Information

82136

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CYSQN Cystinuria Profile, QN, 24 hour In Process

 

Result ID Test Result Name Result LOINC Value
50439 Specimen 31208-2
50440 Specimen ID 57723-9
50441 Source 31208-2
50442 Order Date 82785-7
50444 Method 49549-9
TM38 Collection Duration 13362-9
VL36 Urine Volume 3167-4
3583 Cystine 13966-7
3589 Lysine 25464-9
3590 Ornithine 25491-2
3591 Arginine 25322-9
50446 Amendment In Process
50447 Reviewed By No LOINC Needed
50448 Release Date 82772-5

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

Analytic Time

3 days (not reported on Saturday or Sunday)

Urine Preservative Collection Options

Ambient

No

Refrigerated

Yes

Frozen

Yes

6N HCl

No

50% Acetic Acid

No

Na2CO3

No

Toluene

Preferred

6N HNO3

No

Boric Acid

No

Thymol

No

Forms

New York Clients-Informed consent is required. Please document on the request form or electronic order that a copy is on file. An Informed Consent for Genetic Testing (T576) is available in Special Instructions.