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You can’t get blood from your own elbow… it’s impossible to put the needle in properly yourself without absolutely destroying some veins going in and going out. I don’t know why the guy didn’t teach him how to safely draw blood HIMSELF cause all he did was do a standard blood draw as any nurse or phlebotomist would do.
This is by no means me telling anyone to do this or that it’s safe or that anyone should try this so keep that in mind!
But if you’re gonna do it yourself like this guy wants, do it in the leg or in the wrist. Wrist is easier, tourniquet under elbow and do is so tight that your arm goes very slightly numb. You need to properly cut off the blood circulation for a little while otherwise bad things can happen inside the vein. It’s better to do it up the arm than down is since the thicker “veins” called arteries take the blood to the appendages and the thinner ones (actually called “veins”) take the blood back to the heart. If you see a thin line that’s less than 1mm wide, it’s probably a capillary and you can’t draw blood from those. You can use butterfly needles which are thinner and have a higher chance of actually getting into the vein without any rupturing. While doing a blood draw, have sugar for the love of all that is holy and unholy in this universe. The last thing anyone needs is someone passed out while blood is still flowing out of them and into a blood bag or vials. Anyways I don’t think he will be able to handle using a needle to do blood draws. He’s actually better off cutting his wrist lightly since it’s actually not the best method to bleed out since there aren’t any major arteries in the wrist to bleed out quickly enough. It’s why vampires bite wrists when they just want a quick drink as opposed to draining a victim dry via carotid artery in the neck.
BTW, I’m not a serial killer or a doctor or anything. I want to be a forensic scientist so I know a lot of pretty weird and kinda morbid details about the human anatomy and a lot of things doctors know too. I just found this one part of the story to be extra nonsensical.