There are two basic types of mammograms, screening and diagnostic.
Screening Mammograms
This type of mammogram is used for women who are asymptomatic, meaning they have no complaints or symptoms of breast cancer. Its purpose is to identify breast abnormalities before they can be detected through breast self-exams or clinical breast exams. Screening mammograms generally involve taking x-rays from two views of each breast and can be completed in less than 15 minutes. According to the FDA, screening mammograms can detect 85% to 90% of all breast cancers.
Diagnostic Mammograms
A diagnostic mammogram is administered to women who are experiencing symptoms of breast cancer or have detected a breast abnormality. It involves a more thorough examination and is used to determine the exact size and location of the breast abnormality. Diagnostic mammograms generally take several x-ray views of the breast and require approximately 30 minutes to complete. Women with breast implants or a personal history of breast cancer will usually require a diagnostic mammogram.