Packed cell volume

Packed cell volume (PCV), also known as hematocrit (Hct), is a blood test that measures the proportion of blood volume that is occupied by red blood cells. It is a key test in the evaluation of anemia, polycythemia, and other medical conditions.

Overview

The PCV test is performed by centrifuging blood in a tube and measuring the volume of red blood cells, expressed as a percentage of the total blood volume. The normal range for PCV varies between sexes and age groups, but generally lies between 38% to 52% for males and 37% to 47% for females.

Procedure

The PCV test is usually performed as part of a complete blood count (CBC). Blood is drawn from a vein, typically from the inside of the elbow or the back of the hand. The site is cleaned with antiseptic, and a tourniquet is applied above the area to slow blood flow. A needle is inserted into the vein, and the blood is collected in an airtight vial or a syringe.

Interpretation

A low PCV indicates anemia, which can be caused by a variety of conditions including iron deficiency, vitamin B12 deficiency, or bone marrow disease. A high PCV indicates polycythemia, which can be caused by dehydration, lung disease, or bone marrow disorders.

See also

• Complete blood count
• Anemia
• Polycythemia
• Red blood cell

References

Packed cell volume Resources
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