The hemoglobin H inclusions test is a hematological test to identify HbH inclusions within red blood cells. These are abnormal hemoglobin formations formed by the aggregation of three alpha-globin chains, as seen in alpha-thalassemia. Their detection involves studying stained blood smears under a microscope. The presence of HbH inclusions aids in the diagnosis and management of alpha-thalassemia disorders, potential anemia, and related complications.