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
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 7 mL | Whole blood | Sodium heparin (Green) | Place specimen on ice after draw. | Refrigerated | Do NOT freeze. |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 7 mL | Whole blood | Lithium heparin (Green) | Place specimen on ice after draw. | Refrigerated | Do NOT freeze. |
| 7 mL | Whole blood | EDTA (Lavender) | Place specimen on ice after draw. | Refrigerated | Do NOT freeze. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 3 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | Unacceptable |
| Refrigerated | 5 days |
| Frozen | Unacceptable |
Days Performed
Mon, Wed, Fri
Turnaround Time
3 - 6 days
Methodology
| Name | Description |
|---|---|
| Enzymatic | |
| Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) |
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