This paper compares dual-energy X-ray absorptiometry (DXA) of the spine and hip and broadband ultrasound attenuation (BUA) of the os calcis in 1000 perimenopausal women aged between 45 and 49 years who attended a randomized Osteoporosis Screening Programme. Significant correlations were found between all DXA results and BUA, with the trochanter giving the best numerical correlation with BUA (r=0.354,p<0.0001). bua="" was="" not="" successful="" in="" predicting="" women="" with="" low="" dxa="" measurements,="" with="" only="" 44.0%="" of="" the="" women="" whose="" spinal="" dxa="" falls="" within="" the="" lowest="" quartile="" being="" in="" the="" lowest="" quartile="" of="" bua.="" although="" bua="" is="" a="" poor="" predictor="" of="" spinal="" and="" hip="" bone="" mineral="" density="" it="" may="" provide="" additional="" structural="" information="" important="" in="" fracture="">