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Test Code CHOU Carbohydrate, Urine

Reporting Name

Carbohydrate, U

Useful For

Screening for conditions associated with increased excretion of fructose, galactose, and xylose

 

This test is not recommended as a follow up test for abnormal newborn screening for galactosemia.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
GALU Galactose, QN, U Yes No

Testing Algorithm

Testing begins with carbohydrate analysis. If qualitative results are normal or abnormal but not indicative of galactose, testing is complete.

 

If qualitative results indicate the presence of galactose, then quantitative testing for galactose will be performed at an additional charge.

Method Name

Thin-Layer Chromatography (TLC), Qualitative

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Urine


Ordering Guidance


This test is not appropriate for evaluation of an abnormal newborn screen for galactosemia. For those cases, order GCT / Galactosemia Reflex, Blood and consider GAL1P / Galactose-1-Phosphate, Erythrocytes and GATOL / Galactitol, Quantitative, Urine.



Specimen Required


Supplies: Urine Tubes, 10 mL (T068)

Container/Tube: Plastic, 10-mL urine tube

Specimen Volume: 5 mL

Collection Instructions: Collect an early-morning (preferred) random urine specimen.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Frozen (preferred) 21 days
  Refrigerated  21 days

Reject Due To

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Reference Values

Negative

If positive, carbohydrate is identified.

Day(s) Performed

Tuesday

CPT Code Information

84377-Carbohydrate

82760-Galactose (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CHOU Carbohydrate, U 16550-6

 

Result ID Test Result Name Result LOINC Value
9255 Carbohydrate, U 16550-6

Test Classification

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

Report Available

8 to 15 days

Forms

Biochemical Genetics Patient Information (T602) in Special Instructions.