> For the complete documentation index, see [llms.txt](https://myhealingcommunity.gitbook.io/myhealingcommunity-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://myhealingcommunity.gitbook.io/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/lab-tests-and-root-cause-workup.md). # Lab tests and root-cause workup Bone loss needs more than a DXA number. Lab work can help surface thyroid, inflammatory, nutritional, hormonal, and turnover issues. ### Baseline labs to review * free T4 in an optimal range such as 1.1–1.6 ng/dL or 12–20 pmol/L * low TPO antibodies, ideally within the lab reference range * TSH above 0.5 to help rule out hyperthyroid-driven bone loss * serum calcium 8.8–9.5 mg/dL * B12 above 750 pg/mL * vitamin D 50–80 ng/mL or about 125–200 nmol/L * hsCRP below 1 mg/L * homocysteine below 8 µmol/L * ferritin 35–70 ng/mL ### Bone-turnover markers #### CTX CTX reflects osteoclast activity and bone resorption. Values above 350 pg/mL may suggest excess bone breakdown. One U.S. testing option is Labcorp 500089. Testing notes: * draw first thing in the morning * fast before the test * avoid biotin and collagen for 48 hours * avoid strenuous exercise for 24 hours #### P1NP P1NP reflects bone building. A practical target range is 20–100 µg/L. One U.S. option is Labcorp 140850. Testing notes match CTX. #### P1NP to CTX ratio This ratio can be especially useful. A working range of 100–300 is one way to frame it. A ratio above 150 may suggest bone building is winning. There is one caveat. If nutrient intake is too low, both markers may look low and falsely reassuring. #### Urine DPD Urine DPD is another bone-turnover marker. It rises when osteoclast activity is high. One U.S. testing option is Labcorp 511105. #### Parathyroid hormone Parathyroid hormone can help when parathyroid disease is a concern. Parathyroid calculator\ ### Hormonal and endocrine context Estradiol can also matter when hormone replacement is being used. Practical context: * an estradiol level above 50 pg/mL is often used as a target when HRT is being used for bone support * if HRT starts more than 10 years after menopause or after age 60, lower estradiol targets may be safer * pre-existing plaque raises the need for caution when estradiol rises above 35 pg/mL The higher cardiovascular risk has mainly been described in women who begin HRT after age 60. ### Specialty root-cause testing notes #### 24-hour urine calcium A result below 300 mg/24 h may suggest a renal calcium leak. That means the kidneys may be spilling calcium instead of reabsorbing it. Get a baseline test after 3 days without calcium supplements, then repeat after supplementation if needed. #### 24-hour oxalate A value above 30 mg/24 h may suggest oxalate-related renal leak or kidney-stone risk. #### Food sensitivity testing Food-sensitivity testing is one possible way to explore inflammatory drivers. One example is [**Vibrant Wellness Food Zoomer**](https://vibrant-wellness.com/tests/food-zoomer). {% hint style="warning" %} Bone-turnover markers are timing-sensitive. If the prep is wrong, the result may mislead. {% endhint %} {% hint style="info" %} In the UK, some bone-turnover markers are specialist tests done privately and can be expensive. {% endhint %} ### What’s in this hub * [Bone density testing](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/bone-density-testing.md): DXA interpretation, T-scores, trabecular bone score, and scan-reading pitfalls. * [Lab tests and root-cause workup](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/lab-tests-and-root-cause-workup.md): Baseline bloodwork, bone-turnover markers, and specialist follow-up tests. * [Diet and protein](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/diet-and-protein.md): Protein targets, mineral priorities, and oxalate-related food notes. * [Supplementation](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/supplementation.md): Calcium, vitamin D, magnesium, K vitamins, creatine, and related support notes. * [Exercise and bone loading](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/exercise-and-bone-loading.md): Resistance work, impact loading, and bone-metastasis safety cautions. * [Vitamin K2 research notes](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/vitamin-k2-research-notes.md): Reference links and caution notes on MK-4, MK-7, and arterial-calcification context. * [Genistein and bone health](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/genistein-and-bone-health.md): Research notes on genistein for bone support, including oncology cautions. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://myhealingcommunity.gitbook.io/myhealingcommunity-docs/testing-monitoring-and-biomarkers/bone-health/lab-tests-and-root-cause-workup.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.