Usually blood is drawn from one's arm. The middle where your veins are most prominent..It really is a simple thing and there is really no pain..Maybe e a very quick pinch but don't lose sleep.It is simple ..trust me..
Blood is everywhere in your body, not just in veins. She used a vein where your blood appears white because it wasn't used by your body, once it's used, it turns red and those are the veins you can see
As a laboratory technician I can tell you that we prefer to go for the veins in your arms. The median is the easiest site to hit, although not everyone has easy veins. Depending on both the skill of the phlebotomist/lab technician drawing blood and the veins of the patient, we may have to draw from the sides of the arms, the forearms, or if the veins are especially hard to find, the hands or wrists.
The best thing to do to make it easier on yourself is to drink lots of water, have a decent meal (unless your labs require fasting) and don't psyche yourself out. If you're still feeling a bit nervous, then ask for someone with a lot of experience to draw you. We make it quick.