Unlike with a traditional blood draw, the patient does not see the needle go into the arm nor the tubes of blood. The process takes about two minutes and has a 95% success rate on the first attempt.

The discovery that blood carries short fragments of DNA, known as cell-free DNA (cfDNA), has opened a new window into biological processes and, in combination with advances in sequencing, is ...

The practice of drawing blood has changed very little over the decades. It looks about the same now as it did 50 years ago.