Final answer:
Inadequate mixing of additives in a blood sample may lead to blood clots. Visible agglutination after adding anti-A and anti-B antibodies indicates an AB blood type, which is normal for AB-positive individuals. In emergencies, O-negative blood is used for transfusion due to its universal donor status. So the correct answer is option (B).
Step-by-step explanation:
If additives are not mixed adequately in a blood sample, one possibility is the formation of blood clots in the sample. This is because the additives typically include anticoagulants to prevent clotting. Therefore, inadequate mixing can lead to an uneven distribution of these anticoagulants, resulting in the sample's inability to remain in a liquid state suitable for accurate testing.
In the scenario where a technician collects a blood sample and adds anti-A and anti-B antibodies and both wells show agglutination, this indicates that the patient has an AB blood type. This response is normal for someone with an AB blood type since their blood contains both A and B antigens.
During emergency situations where a patient's blood type cannot be determined in time, O-negative blood is transfused. This is because O-negative blood is considered the universal donor type and is less likely to cause an adverse reaction in the recipient.