Bone health tests measure the turnover behind the density number a DEXA scan gives you. CTx reflects how fast bone is being broken down, P1NP how fast it is being built, and parathyroid hormone with calcium shows the regulation that sits above both. These markers change within months, long before a density scan would, which is why they are ordered to track osteoporosis treatment, to check a low-calcium or low-vitamin D finding, and by athletes and older adults who want to see what training and nutrition changes are doing.
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