Point well taken. I'm still reading about osteopenia but, having compared a 2015 DEXA with the done in September, 2021, and seeing negligible change my PCP dropped his suggestion of Fosamax. I hope more doctors are comparing DEXAs over time and see if the rate of change is changing as that could be an important indicator. Also.if any result looks odd it could merit a sooner retest. There is variability among equipment, generations of equipment, etc., so differing results are possible for reasons other than a change in one's actual bone density. I look forward to tests that measure more than just density as it seems an inadequate diagnostic tool. A few studies are looking at whether patients should refrain from taking calcium for a period of time before having the test to yield a more accurate diagnosis in case newly ingested calcium shows up as bone but isn't (yet).