The methylation workup. Elevated homocysteine is a vascular red flag, but you need upstream markers to know why. This panel measures homocysteine, B12, folate, and the MTHFR genetic variant to identify exactly where your methylation cycle is breaking down. Critical for anyone with an MTHFR variant, cardiovascular risk, cognitive complaints, or elevated homocysteine.
The Methylation + B Vitamins panel measures four things, homocysteine, vitamin B12, folate and the MTHFR genetic variant. Together they show how well the body's one carbon cycle is supplied and running. It suits adults looking into fatigue, cardiovascular risk factors, pregnancy planning, or a family history of low B12 or folate.
One point is worth settling before you order. This panel looks at methylation cycle chemistry and a single gene variant, not at DNA methylation clocks or epigenetic age. This page is educational and is not medical advice.
It measures three blood markers of the methylation cycle, homocysteine, vitamin B12 and folate, plus one genetic result, the MTHFR variant. Three of those are moving numbers that respond to diet, absorption and supplementation. The fourth is fixed for life, because a genotype does not change.
| Group | Markers | What they show |
|---|---|---|
| Methylation Markers | Homocysteine | An amino acid produced during one carbon metabolism. It tends to rise when B vitamin supply or enzyme activity is limited, and research has studied raised homocysteine as a marker associated with vascular and metabolic conditions 1. |
| Methylation Markers | Vitamin B12 | Serum vitamin B12, the cofactor needed to convert homocysteine back into methionine. Research describes B12 as central to one carbon metabolism, with low status associated with neurological and blood cell changes 2. |
| Methylation Markers | Folate | Serum folate, the methyl donor side of the same cycle. Studies indicate that folate status is one of the strongest nutritional determinants of circulating homocysteine 3. |
| Methylation Markers | MTHFR (Genetic Variant) | A common variation in the gene coding for methylenetetrahydrofolate reductase. The C677T variant is associated with reduced enzyme activity and, in some people, higher homocysteine 4. |
What the panel includes is homocysteine, vitamin B12, folate and the MTHFR variant. It does not measure DNA methylation across the genome, an epigenetic clock or biological age, even though one carbon metabolism is the pathway that supplies methyl groups for those reactions 5. Anyone shopping specifically for an epigenetic age estimate should know that before ordering, because those tests use different laboratory methods. Two related blood tests also sit outside this panel. Methylmalonic Acid and Vitamin B6 are often discussed alongside B12 and folate, and neither one is included here.
Because each marker explains the others, and any single one of them leaves the picture unfinished. Homocysteine is the output of the cycle, the number that moves when something upstream is limiting. It is informative precisely because it integrates several inputs at once.
Vitamin B12 and Folate are two of those inputs. B12 and folate work in the same reaction that recycles homocysteine back into methionine, and research describes them as interdependent rather than separate stories 2. A folate result on its own cannot tell you whether the cycle is keeping up. Paired with homocysteine, it starts to.
The MTHFR result adds the genetic context. Research suggests the C677T variant reduces the activity of the enzyme that converts folate into its usable methyl form, and that the effect on homocysteine is strongly shaped by how much folate is available 6. That is why genotype alone is close to meaningless here. The same variant can sit alongside an unremarkable homocysteine in one person and a raised one in another.
A few patterns are worth knowing. Raised homocysteine with low folate points toward supply. Raised homocysteine with a normal looking B12 sometimes prompts a clinician to order methylmalonic acid, which is a separate test, because serum B12 can read adequately while tissue level function lags. Normal homocysteine with a variant genotype is common and usually reassuring in context.
People who already have a specific reason to look at B vitamin status or homocysteine, rather than anyone testing at random. Nobody needs this panel, and ordering it is a choice made with your own reasons in mind.
The situations that come up most often include the following.
If any of those apply, discuss with a clinician whether this panel answers the question you actually have.
You order the panel online, and the lab requisition is emailed to you. From there you book or walk into a Quest or partner lab location, and those locations are available nationwide. A phlebotomist draws a standard blood sample, which covers all four results including the genetic one.
The current price, turnaround and any fasting instructions are listed in the panel details shown on this page. Once results are released, Atlas, FitScript's AI health advisor, reads every marker against optimal ranges and explains what each value sits next to, rather than leaving you with a column of numbers. Add-on panels can be run from the same sample, so a single draw can cover more than one panel if you decide to add something before testing.
Follow the preparation notes listed in the panel details on this page, then keep the rest of your routine as normal so the result reflects a typical day. Drink water in the hours before the draw, because mild dehydration makes venous access harder and can concentrate some analytes.
Supplements matter more here than for most panels. B12 injections, oral B12, folate and B complex products raise measured blood levels and can mask a shortfall that was there a week earlier. High dose biotin, often sold for hair and nails, can interfere with some immunoassay based laboratory methods, which is why labs ask about it. Tell the ordering clinician what you take and when you last took it, and agree a sensible gap with them before testing rather than deciding alone.
Keep taking prescribed medication unless your own clinician tells you otherwise. Testing is not a reason to pause a prescription. Timing is also worth keeping consistent, so if you retest later, booking a similar time of day makes the two results easier to compare.
Read each value as an observation first, then think about what it might reflect, then decide what is worth raising with a clinician. A number is not a diagnosis, and no single value here identifies a disease.
| Marker | Typical lab reference range | Units |
|---|---|---|
| Homocysteine | roughly 5 to 15 | µmol/L |
| Vitamin B12 | roughly 200 to 900 | pg/mL |
| Folate, serum | above roughly 3 | ng/mL |
| MTHFR (Genetic Variant) | reported as a genotype, not a numeric range | genotype |
Those are typical lab reference ranges, and they vary by laboratory, assay, age and sex, so always read your result against the range printed on your own report. A standard reference range describes where most of a tested population falls. An optimal range is narrower and reflects where a marker is targeted for optimization, not a diagnostic cut off. Atlas compares your results against optimal ranges, and a licensed clinician interprets what they mean for you.
One more thing about the chemistry markers. Homocysteine, B12 and folate are snapshots. They shift with recent meals, supplements, absorption and kidney function, so a single reading describes a moment rather than a trend. Retesting after a change in approach is how most people build a trend line, and the interval is set by the clinician reviewing your case. The MTHFR result is different, since genotype is tested once and does not need repeating.
A value outside the standard range is suboptimal, not a verdict. A markedly abnormal result, or one that comes with new neurological symptoms, is worth discussing with a clinician promptly rather than waiting for a scheduled review. Never ignore an out of range result because an article said it was common.
It cannot diagnose anything, and it cannot tell you why a marker is where it is. A low B12 looks the same whether the cause is low intake, poor absorption, an autoimmune process or medication, and separating those usually needs further blood tests, clinical history and sometimes imaging or endoscopy that a clinician orders.
It also does not measure tissue level B12 function, which is where methylmalonic acid is sometimes added, and it does not assess kidney function or thyroid status, both of which influence homocysteine. It does not estimate your risk of any specific disease, and it is not a screening test for cancer or cardiovascular events. Research links one carbon metabolism to a long list of conditions, but association in population studies is not prediction for an individual 2. Genotype in particular is context, not destiny.
This is the narrow, targeted option, built around one metabolic pathway rather than broad nutrient coverage. If your question is specifically about homocysteine, B12, folate and MTHFR, it answers that question and stops there.
The Longevity Nutrients panel is wider in scope and looks across a broader set of nutrient and metabolic markers, which suits someone building a general picture rather than following one thread. The Vitamin Levels panel focuses on vitamin status across several vitamins, so there is some conceptual overlap with the B vitamin side of this panel without the methylation specific markers. FitScript membership covers 150+ biomarkers tested per year, and single panels like this one exist for people who want to answer a focused question now. Panels can also be combined from the same draw.
The current price, turnaround and any fasting instructions are listed in the panel details shown on this page. The panel is HSA and FSA eligible.
MTHFR is the enzyme that converts folate into its active form so your body can use it for methylation. Common variants (C677T, A1298C) reduce that conversion, which can raise homocysteine and affect how you respond to folate and B12. Knowing your variant tells you whether you need methylated forms of these vitamins, and it only needs to be tested once since it never changes.
High homocysteine is an independent cardiovascular risk factor and marker of impaired methylation. The fix depends on which upstream nutrient is deficient, B12, folate, or B6. This panel tells you exactly which to target. Atlas AI builds the specific protocol from your results.
No fasting required, but skip your B-vitamin supplements for 24-48 hours before the draw so results reflect your actual stores, not recent supplementation.
An MTHFR test is a genetic test that looks for common variants in the MTHFR gene, which codes for an enzyme in the folate pathway. The C677T variant may reduce enzyme activity and raise homocysteine in some people. It is a one time result, since your genotype does not change.
An MTHFR blood test and this panel overlap but are not identical. The MTHFR result comes from the same blood sample and reports your genotype. The panel adds homocysteine, vitamin B12 and folate, which show how the methylation cycle is actually running rather than only how it is coded.
A methylation blood test shows homocysteine, vitamin B12 and folate, three markers that reflect how well the one carbon cycle is supplied. Raised homocysteine alongside low B12 or folate suggests the cycle is under supplied. A clinician interprets the combination, not a single value.
No. It measures methylation cycle chemistry and the MTHFR gene variant. It does not measure DNA methylation patterns across the genome, epigenetic clocks or biological age, because those use different laboratory methods. Anyone specifically looking for an epigenetic age estimate should know this panel will not provide one.
Follow the preparation notes in the panel details shown on this page, since requirements vary by panel. Drinking water beforehand helps the blood draw. Mention any supplements, including biotin and B complex products, when you book, and keep taking prescribed medication unless your own clinician tells you otherwise.
Yes. B12 and folate supplements, B complex products and recent injections can raise measured levels and mask a shortfall. High dose biotin can interfere with some immunoassay based laboratory methods. Do not stop prescribed medication to get a cleaner result, and discuss timing with your clinician before testing.
Genotype is tested once and does not change. Homocysteine, B12 and folate are snapshots that shift with diet, supplements, absorption and kidney function, so they are usually rechecked after a change in approach. Your clinician sets the interval based on your results and your reasons for testing.
Not on its own. The C677T variant is common in the general population, and its effect may depend heavily on folate status and other factors. An MTHFR result is interpreted alongside homocysteine, B12 and folate by a clinician. It is not a diagnosis and it does not prescribe anything.