Phlebotomy Technician Practice Exam (NCPT/CPT) 2026 - Free Phlebotomy Practice Questions and Study Guide

When performing a venipuncture, it is important to consider the depth and size of the vein before inserting the needle. This ensures that the needle will successfully enter the vein and allow for proper blood collection. Option B, vein color, may vary and is not necessarily a reliable factor in determining the location of the vein. Option C, arm length, is not relevant to the palpation process. Option D, patient's comfort, is important but should not be the primary consideration when palpating the vein. Therefore, the correct answer is A.