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.
Emergency situations when immediate advice is needed can include hypoglygcaemia, when blood glucose falls too low and there is a risk of injury or coma; or when high blood glucose could lead to diabetic ketoacidosis, a potentially life threatening complication if left untreated.