Bone Resorption (CTX) Test - C-Terminal Telopeptide (CTX) Test

The C-terminal telopeptide (CTX) test is a quantitative measurement of the level of a specific protein fragment in blood or urine, released when type I collagen is broken down during bone resorption (bone catabolism). CTX is one of the most specific and sensitive indicators of bone resorption and reflects the rate of active bone loss, making it an important tool in evaluating bone diseases and monitoring treatment.