RBC is 5.25. HGB is 15.4 and HCT is 47.0. Erythropoietin level is 4. WBC is 9.7. I am concerned about primary or secondary "polycythemia". All my CT scans, ultrasounds and MRI tests have come back negative. Does anyone out there have polycythemia? Is there anything I should be doing? At what level do they start removing blood to reduce the risk of clots/stroke, etc.? Is 17 high enough for that? Thank you for your time.