The test results must fall within the listed acceptable limits in order to continue normal operations. Results outside these limits indicate the need for corrective action. This action depends on the test and does not necessarily mean that facilities have to cease examining patients. Specifically, facilities must not process mammograms when the processor parameters fall outside operating limits. Also, they must not use x-ray units when either the parameters that monitor phantom image QC or the compression force on the x-ray unit fall outside action limits. Likewise, facilities must not use a darkroom when the fog level exceeds the limit in that room, nor use cassettes that fail the screen-film contact test. In the case of darkroom fog, if the source of the fog is determined to be due to a safelight, then films can be processed with that safelight off until such time as the safelight problem has been corrected and the darkroom passes the fog test. With all other test failures, the equipment may continue to be used before corrective actions are performed but such actions must be carried out within 30 days of the test. This is summarized in Table 1.