美國mammogram有兩個臨床指南，家醫從50歲開始，兩年一次。 婦科40歲開始， 一年一次，原則上75歲停止。
所以跟家醫一輩子做13次， 婦科35次。
亞裔乳腺組織密度太高的人很多， B超對密度高的組織有效，美國很多州要求醫師告訴病人密度高的問題， 家醫和婦科醫師因此常常同時order鉬靶和乳超，
但放射科醫師做screen全乳腺B超， 沒有updated mammogram一般不出報告， 因為隻做B超沒有指南。
我們這裏做mammogram後超過半年時（10到11個月）做全乳腺B超沒問題。。。 所以可以大約一年mammogram， 一年B超。 完全符合所有指南。 所有醫師都高興
夠複雜的吧：）））
Breast Cancer | Diagnosis & Tests - FamilyDoctor.org
Ob-Gyns Continue to Recommend Annual Mammograms for ...
美國政府和家醫一致， 或家醫聽政府的
http://www.acog.org/About-ACOG/News-Room/Practice-Advisories/ACOG-Practice-Advisory-on-Breast-Cancer-Screening
The U.S. Preventive Services Task Force [DRAFT]
50 to 74 years: Biennial screening (B recommendation)*
Prior to age 50 years: The decision to start screening mammography should be an individual one. Women who place a higher value on the potential benefit than the potential harms may choose to begin biennial screening between the ages of 40 and 49 years. (C recommendation)*
[NEW] Women with a parent, sibling, or child with breast cancer may benefit more than average-risk women from beginning screening between the ages of 40 and 49 years
75 years of age and older: The current evidence is insufficient to assess the effectiveness of screening mammography in women (I statement)*
