Final answer:
A successful puncture of a vein can be determined by the presence of blood return and the ability to draw blood or administer fluids. Other signs may include swelling, bruising, or mild discomfort at the puncture site.
Step-by-step explanation:
The successful puncture of a vein can be determined by the presence of blood return. When the clinician punctures the vein, they will be able to see the blood filling the syringe or IV catheter if it is properly inserted. The presence of blood confirms that the vein has been successfully punctured.
Another method to confirm a successful puncture is the ability to draw blood or administer fluids through the syringe or IV catheter. If the blood easily flows into the syringe or fluids can be successfully administered, it indicates a successful puncture of the vein.
Additionally, the clinician may observe other signs such as swelling or bruising at the puncture site, or the patient may report a mild pinch or slight discomfort in the area.