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Labcorp Oklahoma, Inc.
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Galactose 1 Phosphate

Order Name GAL1PHOS
Test Number: 3703875
Revision Date 09/18/2024
Test Name Methodology LOINC Code
Galactose-1-phosphate (mg/dL)
Quantitative Gas Chromatography-Mass Spectrometry 2312-7 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 3 mL (2) Whole Blood EDTA (Lavender Top) Refrigerated
Alternate 1 5 mL (2) Whole Blood Sodium Heparin (Green Top / No-Gel) Refrigerated
Instructions Specimen: 3mL (2mL) of EDTA Whole Blood or Sodium Heparin Whole Blood
Stabiliy: Ambient n/a; Refrigerated 72hrs; Frozen: n/a
?Cause for Rejection: Gross hemolysis
GENERAL INFORMATION
Expected TAT 10 - 15 days  
Clinical Use Monitoring dietary therapy of patients with galactosemia due to deficiency of galactose-1-phosphate uridyltransferase or uridine diphosphate galactose-4-epimerase.
Galactose-1-phosphate uridyltransferase (GALT) deficiency is the most common cause of galactosemia and requires lifelong restriction of dietary galactose.
?Galactose-1-phosphate is elevated in patients with galactosemia due to GALT deficiency or uridine diphosphate galactose-4-epimerase deficiency, therefore is a suitable analyte for monitoring dietary compliance. 
Performing Labcorp Test Code 833591 
CPT Code(s) 84378
Lab Section Reference Lab