Specialty Testing Guide › TruHealth Micronutrient Testing
A standard blood micronutrient test measures how much of a nutrient, or a marker of it, is in your serum or plasma at the moment of the draw. TruHealth works differently: it reads DNA methylation from a blood sample and estimates where more than 100 markers would likely fall, reported as percentiles rather than measured levels.
Neither one is simply better. A standard test is the right tool when you need to confirm a specific deficiency or excess and decide on treatment. TruHealth can add a broad, pattern-level overview, but its estimates are not precise enough to dose supplements from on their own.
Key takeaways
- Standard tests give a measured number in real units; TruHealth gives a methylation-based estimate compared with a reference group.
- Standard levels have known blind spots, such as liver disease raising ferritin and serum magnesium missing low body stores.
- Iron, B12, folate, zinc and magnesium are not on TruHealth's published list, so those questions need a standard test anyway.
- For a single, specific nutrient worry, the standard test is usually the more direct first step.
What a standard blood test actually measures
Common nutrient tests include 25-hydroxyvitamin D, ferritin and iron studies, vitamin B12, folate and magnesium. Each reports a concentration in units, compared with the lab's reference range. That makes the result easy to act on and easy to recheck after treatment.
These tests are not perfect. Some levels shift with recent meals, illness or inflammation. Ferritin, the usual marker of iron stores, can be raised by fatty liver disease or alcohol-related liver disease, not only by excess iron.1 Serum holds less than 1% of the body's magnesium, so a normal serum level is a poor guide to total stores.2
Testing more is also not always wiser. The Endocrine Society's 2024 guideline suggests against routine vitamin D blood testing in the general populations it reviewed, because it found no trial evidence supporting routine screening and no clear target level for preventing disease.3 A clinician will usually order a nutrient test because of symptoms, a medicine, a diet or a condition that raises the odds of a problem.
What TruHealth reports instead
TruHealth uses what TruDiagnostic calls epigenetic biomarker proxies. Researchers measured real blood levels in a large research group, then trained models to predict each level from methylation. Your report shows where your predicted value sits as a percentile, compared with a reference population.
The appeal is stability. TruDiagnostic describes conventional micronutrient panels as snapshot measurements that move with meals and hydration, while methylation reflects a longer window.4 The trade-off is precision. In the main paper describing the method, a preprint funded in part by TruDiagnostic, proxies for blood metabolites, which include the vitamin and amino acid markers, had an average correlation of 0.29 with measured values.5 That is a loose relationship.
For details on the panel itself, see what TruHealth measures.
Intracellular and functional panels
A third group of tests comes from specialty labs that report nutrients inside blood cells, such as red blood cell levels, or use functional methods. These are often lab-developed tests, so their accuracy depends on how each lab has validated its method. If one is suggested, ask what the result would change and what published validation the lab can point to.
Side-by-side comparison
| Test type | What it reports | Best fit |
|---|---|---|
| Standard serum or plasma tests (vitamin D, ferritin, B12, folate, magnesium) | A measured concentration in units, against a reference range | Confirming a suspected deficiency or excess, deciding on treatment, checking that treatment worked |
| TruHealth (TruDiagnostic) | Methylation-based estimates for 100+ markers, shown as percentiles against a reference group | A broad overview of nutrition, metabolic and inflammation patterns, and tracking broad trends over time |
| Intracellular or functional panels | Nutrients inside blood cells or functional measures, depending on the lab | Specific situations a clinician chooses; validation varies by lab |
When each one fits
- You take metformin or an acid-suppressing medicine and worry about B12: a standard B12 test. TruHealth does not list B12.
- You are tired and have heavy periods: a blood count and ferritin. Iron is not on the TruHealth list, and iron should never be started without a test.
- You already take high-dose supplements: a standard level for the nutrient in question, to check you are not overshooting.
- You want a wide baseline and plan to work on diet, weight or sleep: TruHealth can fit here, read alongside your routine labs.
Many people end up using both. A reasonable pattern is to use TruHealth for the broad view, then confirm with a standard blood test any estimate that would change treatment. For patients near Philadelphia, standard bloodwork ordered through the clinic is drawn locally.
Next step: how testing works near Philadelphia
If a TruHealth test seems worth adding, TruHealth testing near Philadelphia explains how it is ordered through our Conshohocken clinic, how results are reviewed and who should go elsewhere. The TruHealth hub has the full series.
Frequently asked questions
Is a methylation estimate more accurate than a blood level?
Not for one person's current level. A measured blood level is the direct answer to how much is in your blood today. Methylation estimates may be steadier over time, but they track measured levels only loosely, so they are better suited to spotting patterns than to confirming a deficiency.
If TruHealth shows a low vitamin, should I start a supplement?
Not at a high dose without checking. Confirm it with a standard blood test where one exists, and talk with your clinician about the amount and how long to take it.
Can standard blood tests miss a deficiency?
Yes, sometimes. Serum magnesium can look normal when body stores are low, and ferritin can be pushed up by liver disease. Your clinician may add related tests or weigh symptoms and risk factors to fill the gaps.
Related reading
This article is for general education and is not medical advice. Decisions about testing and treatment should be made with your clinician. If you have severe symptoms, call 911. For a suspected poisoning, call Poison Control at 1-800-222-1222.
