Final answer:
The patient extending their arm for the blood draw is an example of implied consent. Visible agglutination with both anti-A and anti-B antibodies indicates blood type AB positive. Type O negative blood is used in emergencies when the patient's blood type is unknown.
Step-by-step explanation:
The action by the patient that exemplifies implied consent is C) the patient extends their arm for the procedure. Implied consent is a form of consent which is not expressly granted by a person, but rather inferred from a person's actions and the facts and circumstances of a particular situation. When a patient extends their arm in preparation for a blood draw, they are non-verbally indicating their agreement to the procedure, which is a common practice in medical settings.
In the scenarios provided concerning blood sample analysis and emergency transfusions, the visible agglutination after adding anti-A and anti-B antibodies indicates that the patient has blood type AB positive. This is a normal response and not an error by the technician. In an emergency where a patient's blood type is unknown, type O negative blood, often referred to as the universal donor, would be transfused due to its compatibility with all other blood types.
Understanding informed consent is crucial in both research and medical settings to ensure participants and patients are aware of what to expect, any associated risks, and their right to withdraw at any time.