This test is aslo known as HCT Test, Crit Test, Packed Cell Volume Test, PCV Test, PCV.
The blood is made up of red blood cells (RBC), white blood cells (WBC), and platelets which are suspended in a liquid called plasma. A hematocrit (HCT) blood test measures the percentage of RBC in your blood. Red blood cells carry oxygen throughout the body. Having too few or too many of them can be a sign of certain diseases.
A hematocrit blood test can help your health care provider in screening, diagnosis and monitoring the conditions that affect your blood or bone marrow. The test is done as part of a complete blood count (CBC) but may also be ordered on its own if your doctor suspects a condition affecting your RBC.
When the hematocrit value is low, the proportion of red blood cells in the blood is lower than usual. This can indicate:
- The blood has too few healthy red blood cells. This condition is called anemia.
- That the body does not have enough vitamins or minerals.
- Recent or long-term blood loss.
When the hematocrit value is high, the proportion of red blood cells in the blood is higher than normal. This can indicate:
- Dehydration.
- A disorder that causes your body to produce too many red blood cells, such as polycythemia vera.
- Lung or heart disease.
- Living at a high altitude, such as on a mountain.
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