When you find out your bone density is low, it’s easy to feel stuck waiting for your next DXA scan—which often takes one to two years. But your bones are dynamic, living tissue. They are constantly changing, breaking down, and rebuilding every single day.

How can you tell if your lifestyle shifts, diet changes, or medications are actually working right now? The answer lies in bone turnover markers (BTMs).

In a recent discussion with osteoporosis expert Dr. Keith McCormick, holistic bone coach Irma Jennings dived deep into why these specialized blood tests are the ultimate "detective tool" for managing bone health.

What Are Bone Turnover Markers?

Bone turnover markers are simple lab tests that measure specific proteins or enzymes released during the natural bone remodeling cycle. Think of your skeleton as a continuous construction site managed by two main types of cells:

• Osteoclasts: The "demolition crew" that breaks down old or damaged bone (resorption).
• Osteoblasts: The "building crew" that lays down new bone tissue (formation).

By checking these markers, your doctor can see exactly how fast your bones are tearing down versus how effectively they are building up.

The Two Most Critical Markers to Track

• CTX (C-Telopeptide): This measures bone resorption. A high CTX score indicates that your osteoclasts are overly active and breaking down bone too quickly.
• P1NP (Procollagen Type 1 N-Terminal Propeptide): This measures bone formation. It tells you how well your body is producing the collagen matrix needed to build quality bone. Unlike the highly sensitive CTX, P1NP is incredibly stable, usually only varying by 5 to 10 points throughout the day.

Why Doesn't Every Doctor Order Bone Turnover Markers?

If these tests are so helpful, why aren't they standard practice everywhere? As Dr. McCormick points out, BTMs require strict precision to be accurate.

Because bones follow natural circadian rhythms governed by light and your brain's internal clock (the suprachiasmatic nucleus), markers like CTX fluctuate wildly throughout the day. CTX peaks around 3:00 AM and hits its lowest point around 3:00 PM. Testing a patient at 8:00 AM versus 10:00 AM can cause a massive variance of 200 points, leading doctors to falsely believe the test is unreliable. Furthermore, because morning light conditions differ between January and July, your seasonal biological rhythm can naturally shift your baseline markers.

If you don't take the test correctly, your results will be all over the place. To ensure your labs are accurate, remember these strict guidelines:

• Test early and fasting: Schedule your blood draw first thing in the morning.
• Be consistent: Try to get tested at the exact same lab, within the exact same 30-to-60-minute window each time.
• Avoid supplements: Stop taking biotin and collagen for at least 48 hours before your test, as they can severely skew lab readings.
• Skip the heavy lifting: Avoid intense weight training the day before your blood draw to prevent artificially altering your markers.

Decoding Sluggish Bone Formation ("Adynamic Bone")

When a patient displays a severely depressed P1NP score, it indicates poor anabolic capacity—meaning the body is struggling to generate a new bone matrix. Dr. McCormick investigates several critical, often-overlooked systemic issues behind a sluggish P1NP:

• Iron Deficiencies & Anemia: Iron is a mandatory co-factor required to build collagen. If a patient is anemic or low in ferritin, their body physically lacks the raw materials to form a proper bone matrix.
• Hormonal & Muscle Signals: Bones only build when they are told they are needed. Low testosterone levels or a lack of muscle mass failing to signal the bone through physical tension will cause bone building to stall.
• Adynamic Bone & Toxicity: If a patient is around 50 years old and shows rock-bottom markers across the board (such as a P1NP of 12 and a CTX of 140), they may have "adynamic bone"—a state where the bone is completely quiet and doing nothing. One rare but documented cause of this state is heavy metal or aluminum toxicity.

Moving Beyond "One-Size-Fits-All" Osteoporosis Care

Many standard medical approaches treat osteoporosis mechanically—looking at a single T-score and immediately writing a script for a long-term medication. But true bone health requires precision medicine, especially because different classes of medication manipulate your skeletal biology in completely unique ways:

The Bone Medication Spectrum

• Anti-Resorptives (Bisphosphonates like Fosamax/Reclast, Prolia, and SERMs like Evista): These function as anti-resorptives—they slow down or incapacitate the demolition crew. Prolia specifically targets and blocks "RANKL", a transcription factor that stimulates osteoclasts. While this protects bone density in the short term by causing calcium deposition, staying on them too long (beyond three years) shuts down bone turnover entirely. Without natural remodeling, everyday micro-fractures accumulate, eventually making the bone old and brittle.
  
  
• Anabolics (Forteo and Tymlos): These directly stimulate osteoblast cells to build new tissue, creating a completely fresh collagen bone matrix. However, because parathyroid analogs initially accelerate the overall remodeling process, the new bone tissue is still immature and unhardened during the first two to three months. Because of this temporary lag, patients face a slightly increased risk of fracture during the first 90 days of treatment.
  
  
• Biphasic (Evenity): This acts as an antibody against "sclerostin"—a protein generated by osteocytes to act as a natural brake on bone building. It takes the brake off the osteoblasts, letting them build rapidly for the first 6 months, then acts as an anti-resorptive for the final 6 months. (Evenity does not share the initial 3-month fracture danger zone, as it does not raise clastic activity).

Live Audience Q&A with Dr. Keith McCormick

During our session, members of the Bones Tribe community asked specific questions regarding personalized dosing, hidden inflammation, and reading complex scans.

Managing Reclast Infusions Sequentially

Q: Should someone use the CTX test as a guide for when they need another Reclast infusion, rather than just blindly following the standard one-year rule?

Dr. McCormick: Yes, absolutely. For many people, the effects of an infusion can last a year and a half, two years, or even two and a half years. However, using CTX as a guide requires knowing your baseline test before you started treatment:

• If your baseline CTX was very high (e.g., 800 or 1,000): If it drops to 125 three months after the infusion, and climbs to 325 at the one-year mark, you might consider doing it.
• If your baseline was lower (e.g., 450): If it drops to 125, and at the one-year mark it is around 275, I would wait. Even at 18 months, if it’s only at 325, I still wouldn't do it yet because the baseline was 450. I'd check it again at 21 months and consider the next infusion once it crosses 350 for that specific person.

Q: How many Reclast infusions should a person take in a row before stopping?

Dr. McCormick: If you are doing them every single year, three infusions would be my absolute maximum. These drugs stay in your body for a long time (five to 10 years), but their peak effectiveness wears off much sooner. By the time you get to a third yearly infusion, you've built up enough of a reserve that it can sometimes last and remain effective for about three to three and a half years on its own.

Hidden Gluten Flares & Celiac Disease

Q: If someone with celiac disease is accidentally exposed to hidden gluten, how long should they wait before getting their bone markers tested?

Dr. McCormick: If it was a really big flare, I would suggest waiting about two months before getting tested. Celiac disease causes bone loss because it disrupts the gut's ability to absorb nutrients, and it causes a massive spike in antibodies. Because osteoclasts are actually a type of white blood cell and a direct part of your immune system, they "hear the noise" of those rising antibodies, get highly stimulated, and immediately start tearing down more bone.

Understanding DEXA vs. TBS (Trabecular Bone Score)

Q: If an older woman's DXA scan shows a seemingly okay bone density (like a T-score of -2.0) but her TBS (Trabecular Bone Score) is very low (like 1.1), what does that conflict mean?

Dr. McCormick: When the bone density looks good on a DXA but the TBS looks bad, it is a major red flag that usually indicates the patient has osteoarthritis. A standard DXA scan is just measuring "attenuation"—it calculates how many X-rays are blocked by mass, but it cannot differentiate between bone tissue and arthritic buildup. Hardening (sclerosis) or bone spurs in your facet joints will register on a DXA as "good density," falsely inflating your T-score.

Meanwhile, the TBS is a computer pixel analysis that strictly looks at the internal connectivity of the bone's cross-beams (trabeculae). If those internal beams are disconnected, the TBS will show severe weakness (like a 1.1), proving the bone is vulnerable despite what the DXA says. This discrepancy explains why 50% of women who experience a fracture don't actually show osteoporosis on a standard DXA scan.

Proactive Bone Health

By tracking bone turnover markers every six to twelve months, you and your practitioner can actively spy on your bone activity. Instead of guessing, you can see if a medication has done its job, find out if a gut issue like celiac disease is triggering a flare of bone loss, or measure how beautifully your body is responding to heavy lifting.

The medical world is moving rapidly toward generic programs and mechanical systems that automatically slide patients into rigid, predetermined slots. True bone health tracking requires a "detective" mindset. It means looking deeply at the individual person, reviewing past records so you don't repeat unnecessary tests, and looking at how gut health, lifestyle, and systemic inflammation are interacting with your skeleton today before making a clinical decision.

Your bones change long before it shows up on a bone density scan. By using bone turnover markers as your health detective, you can make informed, proactive decisions to protect your skeleton for the long haul.

To watch the full discussion on precision bone health, listen to the complete interview on my YouTube Channel.

You Might Also Find These Posts Helpful:

• Do's and Don'ts When Talking to Your Doctor About Osteoporosis
• Understanding CTx and P1NP - Key Bone Markers
• Navigating Osteoporosis: Expert Insights on Dental Health, Bone Markers, and Treatment Strategies