A type of blood cell that is made in the bone marrow and found in the blood. Red blood cells contain a protein called hemoglobin, which carries oxygen from the lungs to all parts of the body. Checking the number of red blood cells in the blood is usually part of a complete blood cell (CBC) test.
A high red blood cell count can be a sign of: Dehydration. Heart disease. Polycythemia vera, a bone marrow disease that causes too many red blood cells to be made.
A high RBC count could be caused by a number of health conditions or health-related factors, including:
- smoking.
- congenital heart disease.
- dehydration (for example, from severe diarrhoea)
- low blood oxygen levels (hypoxia)
- pulmonary fibrosis (a lung condition that causes scarring of the lungs)
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