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Hematocrit is a common blood test that measures the proportion of red blood cells in your total blood volume. It is expressed as a percentage and helps healthcare providers assess your blood's oxygen-carrying capacity. This test is typically included as part of a complete blood count, which is one of the most frequently ordered laboratory tests during routine health examinations or when investigating symptoms of blood disorders.

The hematocrit test works by determining what percentage of your blood is made up of red blood cells compared to the liquid portion called plasma. Normal hematocrit values vary between men and women, with adult men typically ranging from 40 to 54 percent and adult women from 36 to 48 percent. These differences exist because men generally have higher red blood cell production due to testosterone. Children and pregnant women may have different reference ranges, and values can also be affected by age and altitude where you live.

Abnormal hematocrit levels can indicate various health conditions. A low hematocrit, known as anemia, suggests you have fewer red blood cells than normal, which can result from blood loss, nutritional deficiencies like iron or vitamin B12 deficiency, chronic diseases, or bone marrow problems. Symptoms of low hematocrit may include fatigue, weakness, pale skin, shortness of breath, and dizziness. On the other hand, a high hematocrit, called polycythemia, means you have too many red blood cells. This can occur due to dehydration, lung disease, living at high altitudes, smoking, or certain bone marrow disorders. High hematocrit can make blood thicker and increase the risk of blood clots.

The hematocrit test requires a simple blood sample, usually drawn from a vein in your arm. No special preparation is typically needed, though your healthcare provider will inform you if fasting is required. The test is quick, relatively painless, and results are usually available within hours to a day. If your hematocrit level is abnormal, your doctor may order additional tests to determine the underlying cause and recommend appropriate treatment. Regular monitoring of hematocrit levels is important for people with blood disorders, those undergoing certain treatments, or individuals with chronic conditions affecting red blood cell production.