skanter2, R. Keith McCormick wrote a book called Great Bones (published in 2023). In this book he talks about bone marker tests (pgs 144-145). He provides the ranges and what the high/low numbers mean. Was your CTX and P1NP taken before starting Tymlos as a baseline? Or were these tests taken after starting Tymlos? The answer to this will be a more accurate understanding of what your CTX & P1NP numbers mean. You can buy the book on Amazon. It is a really good resource. Well worth the cost in my opinion.