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23398 Galactose-1-Phosphate, RBC (GAL1P)

Galactose-1-Phosphate, RBC (GAL1P)
Test Code: GAL1PSO
Synonyms/Keywords
Gal1P, Galactose-1-Phosphate, Galactosemia
Useful For
Monitoring dietary therapy of patients with galactosemia due to deficiency of galactose-1-phosphate uridyltransferase or uridine diphosphate galactose-4-epimerase deficiency​
Specimen Requirements

Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
Whole blood ​Lavender top (EDTA) ​Green top (sodium heparin)
3 mL​
2 mL
Collection Processing Instructions

Samples collected in Marshfield must be drawn prior to 2pm (and arrive in lab prior to 3pm).

Specimens collected following a meal can exhibit postprandial elevations. For infants, collect a specimen immediately prior to feeding to avoid this.

Specimen Stability Information
Specimen Type Temperature Time
​WB EDTA Refrigerate 3 days
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Mayo Medical Laboratories​​
Thursday; 8 a.m.​
8 days​
Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS)
Reference Lab
Reference Range Information
Performing Location Reference Range
Mayo Medical Laboratories​​

Reference Interval (normal range): < or = 0.9 mg/dL

Therapeutic range: < or = 4.9 mg/dL

Interpretation
The concentration of galactose-1-phosphate (Gal-1-P) is provided along with reference ranges for patients with galactosemia and normal controls. The recommended Gal-1-P goal for patients with galactosemia is <125 mcg/g of hemoglobin. ​
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
​84378
Synonyms/Keywords
Gal1P, Galactose-1-Phosphate, Galactosemia
Ordering Applications
Ordering Application Description
​Centricity ​Galactose-1-Phosphate, RBC (80337)
​Cerner ​Galactose-1-Phosphate, RBC (80337)
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements

Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
Whole blood ​Lavender top (EDTA) ​Green top (sodium heparin)
3 mL​
2 mL
Collection Processing

Samples collected in Marshfield must be drawn prior to 2pm (and arrive in lab prior to 3pm).

Specimens collected following a meal can exhibit postprandial elevations. For infants, collect a specimen immediately prior to feeding to avoid this.

Specimen Stability Information
Specimen Type Temperature Time
​WB EDTA Refrigerate 3 days
Useful For
Monitoring dietary therapy of patients with galactosemia due to deficiency of galactose-1-phosphate uridyltransferase or uridine diphosphate galactose-4-epimerase deficiency​
Reference Range Information
Performing Location Reference Range
Mayo Medical Laboratories​​

Reference Interval (normal range): < or = 0.9 mg/dL

Therapeutic range: < or = 4.9 mg/dL

Interpretation
The concentration of galactose-1-phosphate (Gal-1-P) is provided along with reference ranges for patients with galactosemia and normal controls. The recommended Gal-1-P goal for patients with galactosemia is <125 mcg/g of hemoglobin. ​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Mayo Medical Laboratories​​
Thursday; 8 a.m.​
8 days​
Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS)
Reference Lab
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
​84378
For most current information refer to the Marshfield Laboratory online reference manual.