Targeted DNA testing, which is becoming more and more available, is focused testing, looking at specific DNA sequences about which research has already been done. This is useful information, but is only a small snapshot of a person’s genetic information. Once research have unveiled information about additional DNA sequences, new tests would have to be purchased. On the other hand, full genome sequencing is a “once in a lifetime” test. As new research comes out identifying more links between DNA sequence and human health, this can simply be applied to your already known sequence.