Hematocrit: Importance, Measurement, and Implications
Hematocrit, also known as packed cell volume, is the percentage of red blood cells in blood. Learn how to measure hematocrit, its normal range, and causes of low and high levels. Proper hematocrit levels are crucial for overall health.
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Presentation Transcript
The haematocrit (Ht or HCT) American English spelling hematocrit also known as Packed cell volume (PCV) erythrocyte volume fraction (EVF).
PCV is the volume percentage of red blood cells in blood. It is normally about 45% for men and 40% for women. It is considered an integral part of a person ,scomplete blood cell count, and platelet count, along with hemoglobin concentration, white blood cell count, and platelet count.
PCV can be determined by centrifuging heparinized blood in capillary tube (also known as a microhematocrit tube ) at 10,000 RPM for five minutes. This separates the blood into layers. The volume of packed red blood cells divided by the total volume of the blood sample gives the PCV. Because a tube is used, this can be calculated by measuring the lengths of the layers.
Measurement of Heamatocrit Collect blood sample in heparinized capillary tube Centrifuge Read by haematocrit reading scale 5
3 about 18% 4 2 1 7
Low hematocrit may be due to: Anemia Bleeding Destruction of red blood cells Leukemia Malnutrition Nutritional deficiencies of iron, folate, vitamin B12 and vitamin B6
High hematocrit may be due to: Congenital heart disease Cor pulmonale Dehydration Erythrocytosis Low blood oxygen levels (hypoxia) Pulmonary fibrosis Polycythemia vera (genetic aberration)
