Galactose-1-Phosphate, Uridyl Trans.
Test Mnemonic
G1PHOS
CPT Codes
- 82775 - QTY (1)
LOINC ®
10970-2
Aliases
- Galactose-1-Phosphate Uridyltransferase (GALT Enzyme), RBC
- Phosphogalactose Transferase
Performing Laboratory
ARUP
FDA Category
Laboratory Developed Test
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| Volume7 mL | TypeWhole blood | ContainerSodium heparin (Green) | Collect TemperaturePlace specimen on ice after draw. | Transport TemperatureRefrigerated | Special InstructionsDo NOT freeze. |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| Volume7 mL | TypeWhole blood | ContainerLithium heparin (Green) | Collect TemperaturePlace specimen on ice after draw. | Transport TemperatureRefrigerated | Special InstructionsDo NOT freeze. |
| Volume7 mL | TypeWhole blood | ContainerEDTA (Lavender) | Collect TemperaturePlace specimen on ice after draw. | Transport TemperatureRefrigerated | Special InstructionsDo NOT freeze. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| Volume3 mL | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
Stability
| Environmental Condition | Description |
|---|---|
| Environmental ConditionAmbient | DescriptionUnacceptable |
| Environmental ConditionRefrigerated | Description5 days |
| Environmental ConditionFrozen | DescriptionUnacceptable |
Days Performed
Mon, Wed, Fri
Turnaround Time
3 - 6 days
Methodology
| Name | Description |
|---|---|
| NameEnzymatic | Description |
| NameLiquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) | Description |
Reference Range
| Galactose-1-Phosphate, Uridyl Trans. | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Galactose-1-Phosphate, Uridyl Trans. | Sex | Age From | Age ToNormal | Type> or = 19.4 | RangeU/g Hb |
Special Info
Do NOT freeze. Hemolyzed specimens are unacceptable. This test is New York DOH approved.
Clinical Info
Enzyme activity may not differentiate variant form of galactosemia or carriers. To monitor therapy in patients with galactosemia, order Galactose-1-Phosphate in red blood cells. One U/g Hb is equivalent to one umol/hour/gram of hb (umol/hr/g hb). Genotype/Galactose-1-Phosphate Uridyltransferase activity (µmol h-1 gHb-1): Classic galactosemia (G/G), < or = 0.7; Duarte galactosemia (D/G), 3.1-7.8; Classic galactosemia carrier (G/N), 6.5-16.2; Duarte homozygous (D/D), 6.4-16.5; Duarte carrier (D/N), 12.0-24.0; Normal (N/N), > or = 19.4