BMI, or "Body Mass Index" is one tool for health assessment of weight in relation to height. Muscle mass, heredity, diet, exercise, and many other factors play into the concept of "healthy weight". At Loudoun Community Midwives, we use BMI as a screening tool for health. Obesity carries risks to general health, and in pregnancy in particular, including associations with diabetes, high blood pressure, C/section and infection. Women with BMI's over 40 are considered high risk during pregnancy, and we refer those women into the care of a physician. Women who are between 35 and 40 BMI can be considered on a case-by-case basis, but may not deliver in the Natural Birth Center.