Glucose is a sugar, the main energy source for the body. Its level varies through the day, higher just after a meal, lower when the ferret is hungry, but the body keeps it fairly constant mainly by controlling the amount of insulin in the blood. However, insulinoma can also cause a high glucose reading, and since diabetes is extremely rare in ferrets, you should double-check any diabetes diagnosis by looking for sugar in the urine as well. This is the percentage of red blood cells in the blood. Red blood cells carry oxygen to the body's tissues and carbon dioxide back to the lungs.
Low readings show anemia.
Part of the immune system. Readings over about 7000 may mean the ferret is fighting off an infection, cold or flu. Unusually low readings indicate anemia and a bone marrow problem. Lymphocytes Another type of white blood cell. Eosinophils Another type of white blood cell.