You are mixing up
BIRADS is an assessment of suspicion, 1(normal) through 5(highly suggestive of malignancy). It has nothing to do with breast density. By law you must be informed of your mammo results within 30 days. Breast density was previously assessed 1(Fatty) through 4(very dense), now changed to A through D because of BIRADS confusion.Some states require density notification as well.