Haematocrit (EVF)

Understanding the marker

Haematocrit measures the proportion of blood occupied by red blood cells. It is read with haemoglobin and the red-cell count; fluid balance also affects the proportion.

Haematocrit is the proportion of blood occupied by red cells. Interpret it with Hb and the other blood count results, using the unit and reference interval on the laboratory report. Hydration can influence the result.

What does high Haematocrit (EVF) mean?

A high haematocrit means red cells make up a greater proportion of the blood. Fluid balance can affect this, but cannot be assumed to explain it. Persistent or marked elevation needs assessment with the other blood-count results.

What does low Haematocrit (EVF) mean?

Low EVF may accompany anaemia or altered fluid balance and is interpreted with Hb and the rest of the blood count.