Final answer:
Rouleaux formation is the RBC abnormality often seen in healthy horses, where red blood cells stack up in a coin-like pattern. This is considered normal, unlike other abnormalities such as Heinz bodies, Howell-Jolly bodies, or autoagglutination, which are associated with disease. The correct option is c.
Step-by-step explanation:
The RBC abnormality often seen in healthy horses is rouleaux formation. Rouleaux formation refers to the stacking of red blood cells (RBCs), resembling a stack of coins. This phenomenon is normal in horses and is not indicative of any underlying disease.
However, it is important to note that other RBC abnormalities such as Heinz bodies, Howell-Jolly bodies, and autoagglutination are associated with various pathologic conditions.
Heinz bodies can be seen in red blood cells on a blood film in active G6PD deficiency, while Howell-Jolly bodies are typically observed following splenic surgery or in certain hemolytic anemias.
Autoagglutination refers to the inappropriate clumping of red blood cells due to antibodies binding to self-red blood cells, often seen in conditions like autoimmune hemolytic anemia.
The term hemagglutination describes the visible clumping of RBCs caused by certain viruses, bacteria, or diseases that trigger antibody production. The correct option is c.