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HelpTest Code GALP Galactose, Quantitative, Plasma
Ordering Guidance
This test is not recommended for follow-up of positive newborn screening results or for diagnosis of galactosemia. The preferred test to evaluate for possible diagnosis of galactosemia, routine carrier screening, and follow-up of abnormal newborn screening results is GCT / Galactosemia Reflex, Blood along with GAL1P / Galactose-1-Phosphate, Erythrocytes.
The preferred test for monitoring dietary therapy is GAL1P / Galactose-1-Phosphate, Erythrocytes for both galactose-1-phosphate uridyltransferase and uridine diphosphate galactose-4-epimerase deficiencies.
This test may be useful for monitoring in patients with galactose mutarotase deficiency.
Necessary Information
Biochemical Genetics Patient Information (T602) is recommended, but not required, to be filled out and sent with the specimen to aid in the interpretation of test results.
Specimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube: Green top (sodium heparin)
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL Plasma
Collection Instructions: Centrifuge and aliquot plasma into a plastic vial
CMH COLLECTION: 1.5 mL in in sodium heparin green vacutainer
Specimen Minimum Volume
Plasma: 0.2 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma Na Heparin | Frozen (preferred) | 365 days |
| Ambient | 20 days | |
| Refrigerated | 20 days |
Testing Algorithm
For information see Galactosemia Testing Algorithm.
Useful For
Screening for galactosemia
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
Day(s) Performed
Tuesday
Report Available
4 to 10 daysReporting Name
Galactose, QN, PReference Values
≤7 days: <5.4 mg/dL
8-14 days: <3.6 mg/dL
≥15 days: <2.0 mg/dL
Method Name
Spectrophotometric/Kinetic
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
82760