Total Antioxidant Capacity of Plasma (ORAC-like measurement)

What Does This Test Measure?

The test evaluates the combined capacity of various antioxidants in plasma—including vitamins (like vitamin C and E), enzymes, and other molecules—to neutralize free radicals. Free radicals are unstable molecules that can cause cellular damage if left unchecked. This measurement is often expressed as an ORAC (Oxygen Radical Absorbance Capacity) value, which quantifies the total antioxidant power of the sample.

Why Might You Need This Test?

Your doctor may order this test if you have symptoms or conditions linked to oxidative stress, such as chronic inflammation, certain autoimmune diseases, or after exposure to environmental toxins. It may also be used in research or clinical settings to monitor antioxidant status in specific populations.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The plasma portion is separated and analyzed using a specialized method (likely a colorimetric or fluorescence-based assay) to determine its antioxidant capacity. Results are compared to a standard reference range to interpret the findings.

What Do the Results Mean?

Lower than expected results may indicate insufficient antioxidant defenses, potentially contributing to oxidative damage. Higher than expected results could suggest an overabundance of antioxidants, though this is less common. Interpretation depends on clinical context, including your overall health and symptoms.