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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 an 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
Monday-Sunday Morning
Report available: Next Day
Report available: Next 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.
Confirming cases of suspected cytochrome b5 reductase
(methemoglobin reductase) deficiency.
Functional studies in families with cytochrome b5
reductase deficiency.
