Welcome to HCM
We understand your concerns
These days, nurses and attenders use their own hint sights for laboratory procedures. But it is not that bad. Finding proper vein is difficult in so many people. Don't worry.
Air bubble inside muscles is absorbed by body itself. Air bubbles in the blood stream is called air embolism
which can be fatal. But small air bubbles cannot harm you and through syringe large bubbles are not common.