[Assessment of a set of FRAX(®)-based criteria for the indication of bone densitometry in Spanish postmenopausal women].

BACKGROUND AND OBJECTIVE: To assess the effect of the application in routine clinical practice of a proposal of thresholds for the indication of bone densitometry in Spanish postmenopausal women.

PATIENTS AND METHODS: We determined the risk of major fracture (RMF) by FRAX(®) of the patients referred to a bone densitometry unit from Primary Care who were untreated. We calculated how many scans would have been avoided if they had been performed only to women ≥ 65 years with a RMF < 10% or women<65 years with a RMF ≥ 3.6%.

RESULTS: We included 643 women with a mean age of 61 (9) years. Twenty-three percent had a normal bone mineral density, 56% had osteopenia, and 21% osteoporosis. The RMF was 5.9 (5.5)%. Eighty of 217 (37%) bone scans in women ≥ 65 years and 273 of 426 (64%) in women<65 years would have been avoided. As a whole, 55% of the scans would have been avoided. The sensitivity of the threshold of 3.6% of RMF for the diagnosis of osteoporosis was 51%, specificity 68%, positive predictive value 20%, and negative predictive value 20%.

CONCLUSIONS: The application of the proposed thresholds for the indication of bone densitometry in Spanish postmenopausal women, based on age and risk of fracture calculated by FRAX(®) would result in a significant decrease of the activity of the bone densitometry unit.