Why can’t they just stuck the syringe anywhere to get blood? Is there something different getting the blood directly from the vein?
In: Biology
You might be wondering that because blood comes out from everywhere if you get a cut or anything,even shallow ones. But thats not pure blood,so to speak. In veins and arteries is blood,which is used as the standard from our body to test. After this blood enters capillaries,it leaks into surrounding tissue,and hence gets its nutrients taken and some waste material added. This fluid then gets taken into our circulatory system later on via lymphatic system(not imp here). So if you cut anywhere,you get small amount of blood that has nutrients taken away and waste material added,plus blood from the multiple small capillaries and other arterioles(small arteries, don’t contribute much to shallow cuts’ bleeding) or venules(small veins). So this blood does not have the exact composition that we need to test,its contaminated. Also,this contaminated blood will not give you the correct cell count of anything at all,as all the cells are mostly still in veins and arteries(they cannot pass into tissues via capillaries easily).RBC and platelets are near absent,and WBC less than in our blood.
So if you prick anywhere to get blood,you will get the wrong amount of nutrients,waste material and cells to measure,which will fuck up your medical reports to the point they will think you are not human.
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