Understanding DHA: Normal vs Optimal Ranges

?What is DHA?

Docosahexaenoic acid (DHA) is a long-chain omega-3 fatty acid that is the structural backbone of cell membranes in the brain, retina, and testes. It comprises approximately 40% of the polyunsaturated fatty acids in the brain. DHA is critical for fetal brain and visual development during pregnancy and early childhood, and for cognitive function throughout life.

!Why It Matters

DHA deficiency during fetal development is associated with reduced visual acuity and cognitive development. In adults, DHA deficiency correlates with depression, cognitive decline, and increased cardiovascular risk. Higher DHA levels are associated with a reduced risk of Alzheimer's disease. Prenatal DHA supplementation is recommended to support brain development in the growing fetus.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Low DHA associated with poor memory, depression, dry eyes, reduced visual acuity
• In infants: impaired visual and neurological development

How to Improve Your Levels

• 1Fatty fish consumption 2-3x/week is the primary source of preformed DHA
• 2Algal DHA supplements are the vegetarian/vegan alternative (algae is where fish get their DHA)
• 3Prenatal DHA supplementation (minimum 200 mg/day) recommended in pregnancy

When to Test

As part of omega-3 fatty acid profile; brain health assessment; pregnancy nutrition monitoring; childhood development evaluation.

Related Biomarkers