Since PCV is not a measure of the actual number of red blood cells, anaemic animals may appear to have a normal or even increased PCV if they also become dehydrated. An example of this phenomenon occurs with [[Hypoadrenocorticism|Addison's disease]], where animals frequently have a non-regenerative anaemia which is masked by dehydration in an Addisonian crisis. | Since PCV is not a measure of the actual number of red blood cells, anaemic animals may appear to have a normal or even increased PCV if they also become dehydrated. An example of this phenomenon occurs with [[Hypoadrenocorticism|Addison's disease]], where animals frequently have a non-regenerative anaemia which is masked by dehydration in an Addisonian crisis. |