The distribution of glucose in the blood of humans and animals is diff erent. On the one hand humans and animals have a different PCV (packed cell volume, hematocrit) – humans: 37-50%, dog: 37-55%, cat: 24-45%, horse: 24-48%, that means that the number of red blood cells differs a lot between the species.
There is also a huge variation between the size of the red blood cells between the species causing a different distribution of glucose in plasma. For example in humans the percentage of glucose in the red blood cells is 42%, whereas 58% of the glucose is situated in plasma.
In cats (less and smaller red blood cells) there is only 7% of the glucose in the red blood cells and the majority of about 93% of the glucose is located in plasma.