Does any relation exist between human blood viscosity and blood glucose levels, or is there any device approved by FDA to monitor blood glucose levels based on blood viscosity? How does that technology work?
I assume that the increased viscosity is due to increased urinary output. I have never heard of it being used as a way to assess glucose concentration. Interesting idea, but if it were possible, it would need to be cheaper than existing methods and at least as good.
In the physiologically relevant range of glucose concentration, accurate determination of glucose solely on the basis of difference in viscosity seems highly improbable. There are too many potential confounding variables that can have far more influence on the viscosity of blood or plasma.