Final answer:
During the ADI test, which is critical for blood transfusion compatibility, the indicator should display moderate-to-large sized dark clumps against a blue-green background, indicating a positive reaction for the presence of antibodies.
Step-by-step explanation:
During the ADI test (antibody detection and identification test), the indicator should display moderate-to-large sized dark clumps against a blue-green background, distributed uniformly over the surface of the test circle. This appearance indicates a positive reaction, suggesting the presence of antibodies reactive under the test conditions. The test is crucial for determining compatibility in blood transfusions, identifying possible alloantibodies, and is a part of routine pretransfusion testing.