RDW
RDW, or red blood cell distribution width, is a measure of the variation in size and shape of your red blood cells. It assesses whether the red blood cells are mostly the same size and shape, or whether there is a significant variation. Normally, red blood cells are uniform in size and shape, but certain blood disorders can cause abnormalities in the size and shape of red blood cells. The RDW test measures the difference in size between the largest and smallest red blood cell in a sample.