Objectives. The Minnesota Department of Health surveyed registered mam
mography facilities to assess their accreditation status prior to full
implementation of the Federal Mammography Quality Standards Act (MQSA
), which mandated accreditation of all mammography facilities by Octob
er 1994; to strategize on the steps that might be taken to avoid closu
re of facilities; and to evaluate the ultimate impact of-the law on th
e availability of mammography in Minnesota. Methods. Mammography facil
ities registered with the Radiation Control Section of the state healt
h department were surveyed five months prior to and four months after
the October 1994 deadline. Data collected included accreditation statu
s, plans for continuing service, number of mammograms performed, and a
reas in which technical assistance was needed. In October 1995, the nu
mber and distribution of facilities were determined from the Radiation
Control Section registration database. Results. The pre-MQSA survey o
f 182 respondents found that 96% planned to continue mammography servi
ces but only 49% were accredited. The remaining 51% had applications i
n progress. In the post-MQSA survey, 70% of 182 facilities were found
to be accredited, and 30% were operating under provisional certificati
on. As of October 1995, although six facilities had closed, there was
a net gain of four mammography facilities providing on-site service. C
onclusions. Despite fears to the contrary, access to mammography in th
e state of Minnesota was not adversely affected by full implementation
of the Mammography Quality Standards Act.