← Return to Is Anyone Else Tracking Your P1NP to CTX Ratio, While Taking Tymlos?

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Profile picture for loriesco @loriesco

AI is cool. So I asked:
if my ctx is currently 131 (two years ago it was 322) and my Pinp is currently 33 (two years ago it was 49) what does that mean if I am on Tymlos for two years?
Its reply:
"Your current bone marker readings indicate that your bone turnover rate has significantly slowed compared to two years ago. This suggests that your bone breakdown (CTX) has decreased, and your bone formation (P1NP) is now within the typical, premenopausal range for adults.Here is a more detailed breakdown of what these numbers mean as you approach the two-year mark on Tymlos (abaloparatide):1. Bone Resorption (CTX) of \(131 \text{ pg/mL}\)What it means: A reading of \(131\) is on the lower side, reflecting a decrease in osteoclast activity (the cells responsible for breaking down bone).Tymlos Context: While Tymlos is an anabolic (bone-building) medication, it generally causes a milder or minimal increase in CTX compared to other drugs like Forteo. Your drop from \(322\) to \(131\) is significant, indicating much less bone dismantling is occurring.2. Bone Formation (P1NP) of \(33 \text{ mcg/L}\)What it means: A P1NP level of \(33\) indicates stable, ongoing bone formation, as it falls comfortably within the typical reference range (roughly 15–75 mcg/L for adult women).Tymlos Context: During the first few months of taking Tymlos, P1NP typically spikes or doubles as the medication rapidly builds new bone. After two years of continuous treatment, bone formation often slows down and trends back toward baseline as the initial intense building phase completes.The Overall PictureOn Tymlos, it is the ratio of building to breaking that matters most. In your case, you have strong, low bone turnover. However, the exact effectiveness of the medication cannot be measured by blood markers alone. These drugs work by stimulating an "anabolic window," meaning they build new bone faster than it is being broken down.Next Steps: The definitive measure of your treatment's success will be your next DEXA Scan, which your doctor will likely use to compare your bone mineral density to your baseline scans.Continuation of Therapy: The FDA Prescribing Information for Tymlos limits the use of the drug to a cumulative 2-year duration. Because of this, it is standard practice for endocrinologists to transition patients to an antiresorptive medication (such as Fosamax, Evenity, or Prolia) following the two-year period to protect and maintain the new bone you have built."
How cool is that?!

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Replies to "AI is cool. So I asked: if my ctx is currently 131 (two years ago it..."

@loriesco As mentioned in the original post and according to the linked video, one result or the other by itself is useless (like knowing one team's score, but not being given the other team's.....no clue if you're winning or losing). So, according to that video if your RATIO is 150 or higher, you are likely BUILDING bone (aka anabolic), which is the desired goal. We know it is a slow process, with many variables, so the annual DEXA is what will have to give a better insight as to what his actually grown. I do not see that you calculated your P1NP:(CTX/1000) RATIO in order for you to see if you are theoretically growing bone or losing bone. Per your numbers listed above, your status at those given times:

Currently (33/.131) = 252 (indicating a strong response to treatment & building bone status)

2 Yrs Ago (49/.322) = 152 (indicating bone is still being built at a slower rate & closer to a "maintaining mode," with bone resporption and building at simikar rates.

I am not a doctor, simply sharing what the videos data crunching established. Without the ratio, you really have little indication of what's happening. Both markers are going to move together. The question is is one outpacing the other, per the ratio. And yes, that's why it is so important to be put on an anti-resorptive medication to lock in the bone growth that has occurred over those two years on Tymlos. Otherwise, you will become in balance and lose more bone at a higher rate than you are capable of building without medication.

And per the video and other infoI've seen, it appears that the rate of bone grows peaks at the 1-3 month mark and is expected to slow moving forward, but still continues to prompt bone growth..... until it evidently drops off at the 18-month mark, per their clinical trials.