Name a common complication of venipuncture.

Hematoma formation is a common complication of venipuncture, which occurs when blood leaks from the vein into the surrounding tissue. This can happen due to several factors, such as improper technique, using a needle that is too large for the vein, or puncturing through the opposite side of the vein. When a hematoma forms, it can result in bruising, swelling, and discomfort at the site of the puncture.

Although other complications, such as infection at the site or air embolism, can occur, they are less common compared to hematoma formation, which is frequently seen after venipuncture procedures. Blood coagulation is a necessary physiological process and is not considered a complication of the venipuncture itself; rather, it helps in the healing after the procedure.