Why is it crucial to know a patient's medical history before blood collection?

Understanding a patient’s medical history prior to blood collection is vital because it allows the phlebotomist to anticipate possible complications or special requirements that may arise during or after the procedure. For instance, a patient with a history of fainting during blood draws may necessitate special precautions, such as positioning the patient in a way to prevent fainting or having someone on standby to assist. Additionally, knowledge of conditions like bleeding disorders or allergies to antiseptics and adhesive bandages enables the phlebotomist to make informed decisions that ensure the safety and comfort of the patient. This proactive approach can help in effectively managing the blood collection process and enhancing patient outcomes.