Final answer:
Before drawing blood, healthcare professionals must obtain informed consent from the patient or their legal guardian. The consent form explains the procedure, risks, and implications, while guaranteeing confidentiality and proper use of the blood sample.
Step-by-step explanation:
Before drawing blood, the healthcare professional must obtain informed consent from the patient or their legal guardian if the patient is under 18 years old. Informed consent is a process in which the risks and benefits of the procedure are explained to the patient, and they are given the opportunity to ask questions and make an informed decision.
The consent form outlines the procedure, potential risks, and possible implications of the blood draw. It also ensures that the patient's confidentiality will be maintained, and that the blood sample will be used for the intended purpose.