It is known that the concentration of plasma glucose is 12% higher than that of whole blood. But since 45-50% of whole blood is red blood cells, shouldn't the plasma glucose be almost double — since it's just the hematocrit that is missing from the denominator.
Obviously something is wrong with this line of reasoning, since it does not meet the observations. Why so? Does whole blood glucose also measure intra-cellular glucose? Is that the reason for the lesser than expected increase?