Lab Testing

Product Description

Overview

8-hydroxy-2′-deoxyguanosine (8-OHdG) is one of the most widely studied biomarkers of oxidative stress. When reactive oxygen species outpace the body’s antioxidant defenses, hydroxyl radicals preferentially attack guanine — the most oxidation-susceptible of the four DNA bases — producing 8-OHdG as a signature lesion.

Cellular repair enzymes excise the damaged base from the DNA strand. Because the excised nucleoside is not reincorporated and is cleared renally without further metabolism, urinary 8-OHdG offers a non-invasive, whole-body snapshot of the rate at which oxidative DNA damage is occurring and being repaired — not just a measure of antioxidant capacity in isolation.

Clinical Utility

8-OHdG helps quantify oxidative burden in patients where free radical stress is suspected to be driving or accelerating pathology. Elevated levels have been associated with:

• Chronic inflammatory and autoimmune conditions
• Metabolic dysfunction, insulin resistance, and type 2 diabetes
• Cardiovascular disease and endothelial dysfunction
• Neurodegenerative processes
• Environmental and occupational exposures, including heavy metals, solvents, and air pollutants
• Tobacco use, excessive alcohol intake, and overtraining
• Poor sleep quality and chronic psychological stress
• Malignancy and carcinogenesis risk

Why Providers Order It

Unlike downstream markers that reflect damage already established, 8-OHdG measures an active process — making it well suited to longitudinal monitoring. Practitioners commonly use it to:

• Establish a baseline oxidative stress burden before intervention
• Objectively assess response to antioxidant, mitochondrial, or detoxification support
• Corroborate suspected toxicant exposure alongside heavy metals or environmental panels
• Track the biochemical impact of lifestyle modification (smoking cessation, sleep, training load, dietary change)
• Add a mechanistic layer to workups for unexplained fatigue, accelerated aging, or chronic disease

Interpretation Notes

Results are reported normalized to urinary creatinine to correct for hydration status. 8-OHdG is best interpreted in clinical context and alongside complementary markers — including lipid peroxides, glutathione status, hs-CRP, and toxic element testing — rather than as a standalone finding.