Which of the following is an essential principle of blood transfusion?

Informed consent from the patient or their guardian is a fundamental principle of blood transfusion because it ensures that patients are actively involved in their care and have the right to understand the procedure they will undergo. Informed consent involves providing patients with comprehensive information about the benefits and risks associated with a blood transfusion, allowing them to make educated decisions regarding their treatment options. This principle emphasizes the ethical responsibility of healthcare providers to respect patient autonomy and ensure transparency in medical practices.

Understanding informed consent is critical in the context of transfusions, as it helps to build trust between healthcare providers and patients, and protects patients' rights. It also serves to promote patient safety, as it ensures that individuals have the opportunity to ask questions and express any concerns regarding the transfusion process.