Catalytic activity of cytochrome c oxidase in red blood cells (erythrocyte cytochrome c oxidase activity)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like fatigue, weakness, or shortness of breath that could suggest mitochondrial disorders or conditions affecting red blood cell function. It may also be used in research or specialized diagnostic settings for inherited metabolic or blood disorders.

What to Expect During the Test

A small blood sample is drawn from a vein in your arm. The sample is then analyzed to measure the enzyme activity. This process typically takes about 30 minutes and is usually done in a lab setting. You may feel slight discomfort but no pain from the needle.

Preparation and Sample Collection

No special preparation is needed for this test. You can eat and drink normally on the day of your blood draw. If you are taking any medications, let your provider know as they may affect the results.

Possible Results and Interpretation

Results are compared to a reference range for healthy individuals. Lower than expected levels may indicate mitochondrial dysfunction or conditions affecting red blood cell energy production. Higher levels may not be directly clinically significant unless part of a broader evaluation.