已确认可信度 89%The FDA[1] page says "Enforcement of the MQSA regulations as amended by the 2023 MQSA Final Rule began on September 10, 2024"; the rule has no end date, so the period is open-ended.
Every US mammography facility must now tell patients in writing whether their breast tissue is dense, which can hide cancers on a mammogram, under the FDA's amended Mammography Quality Standards Act rule.