Why might a phlebotomist need to perform a blood draw in an alternate site?

Performing a blood draw in an alternate site is often necessary when there are issues accessing the primary site, such as an injury, illness, or challenging anatomy that makes the vein difficult to locate or puncture. Situations may include edema, scars, or inflammation at the primary site that can complicate the procedure and increase the risk of complications. Considering that phlebotomists strive for both accuracy and patient safety, identifying alternative sites ensures that the procedure can be completed successfully, minimizing discomfort for the patient and maintaining blood draw efficiency.

While patient comfort and preference may also play a role in choosing a site, the primary concerns regarding access due to physical obstacles, such as injury or disease, take precedence in medical practice where functional and safe access is required.