Days Set Up
Tuesday, Thursday
Analytic Time

2 - 10 days

Soft Order Code

Test Updated:


Cytochrome B5 Reductase
Methemoglobin Reductase, Erythrocytes

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Test Overview

Test Methodology

Kinetic Spectrophotometry (KS)

Test Usage

Confirming cases of heterozygous or homozygous methemoglobin reductase deficiency; genetic studies in families with methemoglobin reductase deficiency.

Reference Range

6.6 - 13.3 U/g hemoglobin

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Collect blood in an yellow top (ACD) solution B tube.

Collection Offsite

Collect blood in an yellow top (ACD) solution B tube. Refrigerate intact specimen; do not freeze.

Normal Volume
6 mL ACD (solution B) whole blood
Minimum Volume
1 mL ACD (solution B) whole blood

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.