Go consult with hematology. There is no one on this board who can meaningfully comment on the clinical significance on your elevated hematocrit. You have another observation that your whole blood viscosity may indeed be elevated. The link shared above helps you to understand why. Ask your hematologist about plasma viscosity and blood markers for inflammation / proteins in plasma. All elevated hematocrit (same value, e.g., 53%) is not created equal with respect to whole blood viscosity.