CTX measures a residue left in the blood by bone loss
P1NP measures a different residue left in the blood when new bone is laid down.
Some of our cells break bone down others deposit new bone.
Osteoclasts represented by CTX clear away fissured bone and call out the osteoblasts represented by P1NP.
We need both types of cells to have strong bones.
Most of our medications stop the process entirely by blocking the the initiating bone breaking cells. They prevent fracture by collecting the old fissured bone.
Prolia and Evenity lay down new bone without clearing away the older fissured bone.
It's good to know what your bones are doing before taking a medication. It can help decide which medication would be best at preventing fracture. In general the bone markers are used to see if the medication is making your bones stronger. This way you don't take a medication for a year or two, that simply isn't working.
Your primary can order bone markers, and your endocrinologist can order bone markers. The endocrinologists are usually better at getting your insurance to pay. But many endocrinologist don't order them.
You can order your own, but you have to pay for them. The best price is at Jason Health.
https://www.google.com/search?q=osteoporosis+bone+marker+video&rlz=1C1CHBF_enUS1151US1151&oq=osteoporosis+bone+marker+video&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIHCAEQIRigATIHCAIQIRigATIHCAMQIRigATIHCAQQIRigATIHCAUQIRifBdIBCTEwNDY1ajFqOagCCLACAfEFICIgjMelVLw&sourceid=chrome&ie=UTF-8#fpstate=ive&vld=cid:2a6aae68,vid:3q1N_wzxZ_o,st:0