NHA Certified Phlebotomy Technician (CPT)Collection RoutineMedium
A phlebotomy technician is performing a venipuncture and observes that the blood flow into the tube is very slow, forming small droplets on the inside of the tube. Which of the following actions should the technician take first?
- ASwitch to a smaller gauge needle.
- BGently adjust the needle position.
- CRemove the needle and try a new site.
- DApply more pressure with the tourniquet.
Show answer & explanationAnswer & explanation
Correct answer: B. Gently adjust the needle position.
Slow blood flow or small droplets often indicate that the needle is not fully or correctly seated in the vein. A gentle adjustment can often correct this without requiring a new stick.
Why the other options are wrong
- A. Switching to a smaller gauge needle would require a new stick and is not the first step for slow flow with an already inserted needle.
- C. Removing the needle should be a last resort after attempting adjustments, as it requires a new stick.
- D. Applying more pressure with the tourniquet could cause hemolysis or discomfort and is unlikely to fix a poorly positioned needle.
Troubleshooting Slow Blood Flow
When blood flow is slow or stops during venipuncture, the initial troubleshooting step is to gently adjust the needle's position to ensure it is properly seated within the vein lumen.
- Common causes: needle not fully in vein, bevel against vein wall, vein collapse
- Gentle adjustment is often sufficient
- Avoid excessive probing
- If unsuccessful after adjustment, remove and try new site
Memory trick: If the blood is slow, 'Adjust' and 'Assess' before you 'Abort'.