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The page below is a sample from the LabCE course Phlebotomy. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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  • Blood clots when the coagulation factor proteins within the plasma are activated.
  • Blood starts to clot almost immediately after it is drawn unless it is exposed to an anticoagulant.
  • Clots within the blood specimen, even if not visible to the naked eye, will yield inaccurate results.