Hematocrit levels indicate the proportion of red blood cells in your blood, essential for transporting oxygen. Low hematocrit levels, or anemia, result in a diminished oxygen-carrying capacity, leading to symptoms like fatigue, paleness, and shortness of breath, often due to dietary deficiencies, significant blood loss, or bone marrow issues. Treatment targets the cause, possibly requiring dietary supplements or blood transfusions. High hematocrit, or polycythemia, means an excess of red blood cells, which can thicken blood and slow circulation, raising clotting risks, possibly from high altitude, smoking, or dehydration. Management may involve removing blood or medication. Monitoring hematocrit levels helps assess and address blood health, considering personal health history and lifestyle.