Patient's question:
NoDoctor's answer:
A regular menstrual cycle typically has an interval of at least 20 days or no more than 45 days between two menstrual periods. The duration of a normal menstrual period is usually 2 to 7 days, with most lasting 3 to 5 days. The average amount of blood loss is about 50 milliliters, but it can range from as little as 20 milliliters to as much as 100 milliliters. Menstrual blood is dark red because it contains fibrinolysin, which prevents the blood from clotting.