If it is not worth taking the follow-up action, then it is not worth doing the screening either. Concrete example. Younger women have firmer breasts. A chunk o

If it is not worth taking the follow-up action, then it is not worth doing the screening either. Concrete example. Younger women have firmer breasts. A chunk of relatively firm breast looks a lot like cancer. Therefore the younger a woman is, the higher the odds are of a false positive from a mammogram. As a result a woman who is 30-40 SHOULD NOT get a mammogram UNLESS she has a variety of specific risk factors that increase the odds that a positive on the test is a true positive, and not a false positive. You may verify that guideline description against https://www.cancer.org/cancer/breast-cancer/screening-tests-and-early-detection/american-cancer-society-recommendations-for-the-early-detection-of-breast-cancer.html https://www.cancer.org/cancer/breast-cancer/screening-tests-....