Blood Collection Problems: Unsatisfactory Specimens

What if no blood flows when the needle is in place?

  • The needle may not be in a vein. Try slightly manipulating the needle. If no blood flows, withdraw the needle and repeat the venipuncture. Never probe the patient’s arm with the needle. 
  • The bevel of the needle may be compressed against the inside of the vein wall. Slightly manipulating the needle should result in blood flow. 
  • The needle may have passed entirely through the vein. Pull it back slightly, and blood should flow.

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