Folate · high result
What does a high Folate mean?
Short answer
A high folate level almost always reflects supplements or fortified foods and is not harmful in itself. The one caution: high folate intake can mask the anemia of an undiagnosed vitamin B12 deficiency while nerve damage continues, so a high folate with tingling, memory change or a high MCV should prompt a B12 check. Rarely, very high folate accompanies B12 deficiency itself (folate can't be used without B12).
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
What is the normal range for Folate?
- age 18+: 3.40 – 25.0 ng/mL
Full reference table, citations and testing options: Folate biomarker page.
What are the common causes of high Folate?
- Folic acid supplements, prenatal vitamins, fortified cereals
- Vitamin B12 deficiency (unused folate accumulates)
- Some intestinal bacterial overgrowth
What symptoms go with high Folate?
- None from folate
What do clinicians usually check next?
- Vitamin B12 and methylmalonic acid if symptoms or a high MCV are present
- Supplement review
Follow-up tests available at TestWell: Vitamin B12 ($25.99), Methylmalonic Acid (MMA) ($49.99).
How do you recheck Folate?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Vitamin B12 & Folate | Test · 2 biomarkers | $36.99 | No | 2–4 business days |
Common questions
Is too much folic acid dangerous?
Excess is excreted and the level itself isn't harmful. The concern is masking B12 deficiency, so a B12 test is the sensible companion.
Sources
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.