A dried blood spot (DBS) is the method most at-home fatty-acid tests use. You prick your finger, let a few drops fall on the card, let it dry and post it.
The method has been validated against regular venous blood samples for fatty-acid analysis. The most important thing for a good result is to follow the instructions carefully.
Sources
- [source pending] Source needed: validation of dried blood spot fatty-acid analysis against venous samples