clear vein to you.
Attach the arm from the upper part by elastic ligament to help you in more determination of the vein.
Disinfect the place you will inject then insert the syringe gently and withdraw the suitable amount of blood that you need.
Note: difference between plasma & serum:
Plasma produced when we centrifuge EDTA blood.
but
Serum produced when we centrifuge fresh blood.
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