Haematocrit

 In the lab blood can be placed in a test tube and different layers will form, one of these is called the haematocrit which is also known as the packed cell volume. It represents the volume of blood containing red blood cells and you can measure this because it settles at the bottom of the test tube due to reb blood cells being the heaviest.

For women the normal range of the haematocrit is 36.1% - 44.3% and for men the normal range is 40.7% - 50.3%.