NHA Certified Phlebotomy Technician (CPT)Collection RoutineMedium
A phlebotomy technician is drawing blood from a patient and notices that the blood flow immediately stops after the first tube is filled. The needle is still in the vein. Which of the following is the most appropriate next step?
- AAsk the patient to pump their fist vigorously.
- BRemove the needle and attempt another venipuncture at a different site.
- CGently withdraw the needle slightly or advance it further.
- DApply a new tourniquet and try to draw more blood.
Show answer & explanationAnswer & explanation
Correct answer: C. Gently withdraw the needle slightly or advance it further.
If blood flow stops and the needle is still in the vein, it often indicates the needle has shifted slightly, either pressing against a vein wall or partially out of the vein. Gently adjusting the needle's position (withdrawing slightly or advancing a little) can re-establish flow.
Why the other options are wrong
- A. Pumping the fist can hemolyze the specimen and is not recommended to re-establish blood flow.
- B. Removing the needle prematurely is unnecessary if the needle is still in the vein; this should be a last resort.
- D. Applying a new tourniquet is unlikely to resolve a mechanical issue with needle placement and could cause discomfort.
Loss of Blood Flow During Venipuncture
Interruption of blood collection during a venipuncture while the needle remains in the vein, often due to needle displacement.
- Can be caused by needle against a valve or vein wall.
- Can be caused by needle going through the vein.
- Gentle adjustment is usually the first corrective action.
Memory trick: Needle stuck? Adjust, don't pluck!