One (rare) unit of heat is the pound calorie (lb-cal), defined as the amount of heat required to raise the temperature of one pound of water by one degree Celsius. On this scale the specific heat of water would be 1 lb-cal/(Kâlb).
Usually, menstrual bleeding lasts about 4 to 5 days and the amount of blood lost is small (2 to 3 tablespoons). However, women who have menorrhagia usually bleed for more than 7 days and lose twice as much blood. If you have bleeding that lasts longer than 7 days per period, or is so heavy that you have to change your pad or tampon nearly every hour, you need to talk with your doctor.
Excessive red blood cells can cause, blood clots, heart attack, and strokes. So for me it is a matter of what risk is worse.. and Kidney failure is less of a risk than heart failure.. Yes I now am getting blood tests twice a week... along with twice weekly phlebotomy.. that means they remove 1/2 liter of my blood.