Too many red blood cells being made(Polycythaemia).
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Some conditions lower the ESR- for example,
heart failure, Polycythaemia and sickle-cell anaemia.
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Sometimes a blood test can show changes(called Polycythaemia) that suggest you have chronically low levels of oxygen(hypoxia).
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Sometimes a blood test can show changes(called Polycythaemia) that suggest you have persistently low levels of oxygen(hypoxia).
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A problem with the blood, such as abnormal haemoglobin(the blood can't take up enough oxygen)
or a high concentration of red blood cells(Polycythaemia).