Capillary or peripheral blood
 • From tip of finger or lobe of the ear.
 • Clean the site with an alcohol swab .
 • Let the skin dried .
 • Puncture is mad with disposable lancet.
 • The second drop is used.
 • Sterile gauze   applied with  slight pressure.
      Venous blood collection:
  • From anti cubital fosaa.
  • Rubber tourniquet is  used .
  • Clean the site with an alcohol swab. 
  • Let the skin dried .
  • Vain fixed with the finger .
  • Forearm supported with armrest.
  • Sterilized syringe and needle  used .
  • Held the syringe between  the thumb and the index finger .
  • Tip of the index finger on the hub of the needle 
  • As  guide.
 When the needle in the vein  sudden reduction of 
 resistant .
 appearance of blood in syringe.
 keep the needle fixed  and pulling  piston  gently .
 the tounguet loosend  and needle withdrawn.
 sterile gauze is applied  and mild peusser applied .
                                         Anticoagulants:
            Mixture of ammonium and potassium oxalate
            precipitation of calcium oxalate (toxic so cannot be used for blood 
            transfusion).
             trisodium citrate
            combines with calcium in the blood and gives an un-ionized calcium 
            compound (can be used in blood transfusion). 
            EDTA (ethylene diamine tetra acetic acid)
            Heparin