What is an indication of hematocrit being high?

High hematocrit indicates a greater concentration of red blood cells in the blood compared to plasma. This increase in the proportion of red blood cells can lead to thicker, more viscous blood. When hematocrit levels are elevated, it suggests that the blood is less diluted, resulting in a higher viscosity which can affect circulation and lead to complications such as thrombosis because the heart has to work harder to pump this thicker blood. This concept is fundamental in understanding how hematocrit levels affect overall blood flow and cardiovascular health.