Final answer:
The most commonly used screening tool for fetal anemia associated with Rh incompatibility is the indirect antiglobulin test (IAT), also known as the indirect Coombs' test. It screens pregnant women for antibodies that may cause hemolytic disease of the newborn (HDN). Agglutination indicates the presence of antibodies and the need for further investigation.
Step-by-step explanation:
The most commonly used screening tool for fetal anemia associated with Rh incompatibility is the indirect antiglobulin test (IAT), which is also known as the indirect Coombs' test. This test screens pregnant women for antibodies that may cause hemolytic disease of the newborn (HDN). The IAT is performed by checking the patient's serum against pooled type O red blood cells that express antigens other than A and B. If agglutination occurs, it indicates the presence of antibodies and the need for further investigation.