Alpha-linolenic acid (18:3, ALA)

Adequate ALA intake supports anti-inflammatory balance and cardiovascular health. However, the conversion to EPA and DHA in the body is limited, so direct dietary sources of these long-chain omega-3s are still important.

Most adults benefit from yearly ALA testing as part of a fatty acid panel. After a sustained change in diet or supplementation, retest at 3 to 4 months.

At baseline / for screening: Once every 12 months as part of a fatty acid panel. More frequently, every 3 to 6 months, if you're managing a cardiometabolic concern where fatty acids matter.

When monitoring an intervention or change: Retest 3 to 4 months after a sustained change in dietary fat, such as increasing fatty fish, omega-3 supplements (EPA/DHA), or reducing seed oils. Red cell membranes take this long to fully reflect the new intake. Day-to-day variability is minimal, so only sustained dietary patterns shift the picture meaningfully; don't expect quick changes from short-term diet shifts.

Note: ALA reflects recent intake (chia, flax, walnuts) over months. After dietary changes, wait 3 to 4 months for the value to reflect the new pattern; short-term intake shifts don't move the picture meaningfully.