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The recommended angle of insertion for a venipuncture needle typically ranges from 15 to 30 degrees. This angle allows for optimal access to the vein while minimizing trauma to the surrounding tissue. At this angle, the bevel of the needle can effectively enter the vein's lumen, allowing for blood collection without causing excessive irritation or damage to the vessel wall.

When the angle is too shallow, there is a risk the needle may slide across the vein rather than entering it. Conversely, if the angle is too steep, it may lead to puncturing the back wall of the vein or missing the vein entirely. The 15-30 degree range strikes a balance, ensuring a successful venipuncture with less discomfort for the patient and an efficient procedure for the health professional.