What are causes of haemodilution?

Haemodilution is primarily caused by an increase in plasma volume relative to red blood cells, which can occur due to factors such as excessive fluid intake, intravenous fluid administration, or conditions like heart failure and renal disease. It can also result from blood loss, where the body compensates by retaining fluid to maintain blood volume. Additionally, certain medical treatments or therapies, such as during surgery or in critical care settings, can lead to haemodilution.