Depth and angle are the critical issues for vessel...
Depth and angle are the critical issues for vessel detection. Even if you locate a vein at the skin's surface, it's still easy to miss when you try to insert a needle into the tissue below.
Depth and angle are the critical issues for vessel detection. Even if you locate a vein at the skin's surface, it's still easy to miss when you try to insert a needle into the tissue below.