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HelpTest ID GPI1 Glucose Phosphate Isomerase Enzyme Activity, Blood
Specimen Required
Container/Tube:
Preferred: Yellow top (ACD solution B)
Acceptable: Lavender top (EDTA)
Specimen Volume: 6 mL
Collection Instructions: Send in original tube. Do not transfer blood to other containers.
Useful For
The evaluation of individuals with Coombs-negative chronic hemolysis
Method Name
Kinetic Spectrophotometry (KS)
Reporting Name
Glucose Phosphate Isomerase, BSpecimen Type
Whole Blood ACD-BSpecimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole Blood ACD-B | Refrigerated | 20 days |
Reference Values
≥12 months: 40.0-58.0 U/g Hb
Reference values have not been established for patients who are <12 months of age.
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
84087
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| GPI1 | Glucose Phosphate Isomerase, B | 44050-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| GPICL | Glucose Phosphate Isomerase, B | 44050-3 |
Day(s) Performed
Tuesday, Thursday
Report Available
1 to 6 daysForms
If not ordering electronically, complete, print, and send a Benign Hematology Test Request (T755) with the specimen.