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Cytochrome b5 Reductase Enzyme Activity, Blood
Test Code39856
CPT Codes
82657
Preferred Specimen
6 mL whole blood collected in an ACD solution B (yellow-top) tube
Minimum Volume
1 mL
Other Acceptable Specimens
Whole blood collected in: EDTA (lavender-top) tube
Instructions
Send specimen in original tube. Do not transfer blood to other containers. Patients age is required.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: Unacceptable
Refrigerated: 18 days
Frozen: Unacceptable
Refrigerated: 18 days
Frozen: Unacceptable
Methodology
Kinetic Spectrophotometry
Setup Schedule
Set up: Weekly; Report available: 1 day
Reference Range
≥12 months of age: 7.8-13.1 U/g Hb
Reference values have not been established for patients who are <12 months of age.
Reference values have not been established for patients who are <12 months of age.
Clinical Significance
Evaluation of patients with cyanosis. Confirming cases of suspected cytochrome b5 reductase (methemoglobin reductase) deficiency. Functional studies in families with cytochrome b5 reductase deficiency.
