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HelpTest ID METR1 Cytochrome b5 Reductase Enzyme Activity, Blood
Necessary Information
Specimen Required
Collection Container/Tube:
Preferred: Yellow top (ACD)
Acceptable: Lavender top (EDTA)
Specimen Volume: 6 mL
Collection Instructions: Send whole blood specimen in original tube. Do not aliquot.
Secondary ID
65609Useful For
Evaluation of patients with cyanosis
Confirming cases of suspected cytochrome b5 reductase (methemoglobin reductase) deficiency
Functional studies in families with cytochrome b5 reductase deficiency
Specimen Type
Whole Blood ACD-BSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Whole Blood ACD-B | Refrigerated | 18 days |
Reject Due To
| Gross hemolysis | Reject |
| Fully clotted | Reject |
Reference Values
≥12 months of age: 7.8-13.1 U/g Hb
Reference values have not been established for patients younger than 12 months.
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Day(s) Performed
Performed weekly
Report Available
1 to 6 daysCPT Code Information
82657
Forms
If not ordering electronically, complete, print, and send a Benign Hematology Test Request (T755) with the specimen