Although the Body Mass Index (BMI) is a popular and accurate measure of healthy body weight, it is not without flaws. BMI is an assessment that does not account for body composition.
Since there are a wide variety of body shapes and distributions of muscle, bone mass, and fat, BMI should be used in combination with other measurements rather than as the only indicator of a person’s health.
To ensure your physical safety, minimize complications, and optimize the chances of a successful embryo transfer and viable pregnancy, most IVF centers will require a BMI of 33 or less to consider you as a candidate for becoming a surrogate.