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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. Patient's 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
FDA Status
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 U.S. Food and Drug Administration.
Setup Schedule
Setup: Performed Weekly; varies, Reports: 1 Day
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.