Folic Acid (LCMSMS)

Optimal Result: 8.9 - 24.6 nmol/L.

Methylation & Folate Metabolism HDRI Health Diagnostics and Research Institute

From Healthmatters.io Team

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Folic acid is the synthetic form of folate commonly used in nutritional supplements and food fortification. Before the body can use folic acid in essential metabolic pathways—including DNA synthesis, methylation, neurotransmitter production, and red blood cell formation—it must be converted into active folate forms via several enzymatic steps. One critical enzyme in this process is dihydrofolate reductase (DHFR), which has limited activity in many individuals.

Measuring folic acid using LC-MS/MS (liquid chromatography–tandem mass spectrometry) provides an accurate assessment of unmetabolized folic acid, which may accumulate when intake exceeds the body’s capacity for conversion. Elevated folic acid can signal enzyme bottlenecks, impaired folate metabolism, or high supplemental intake. Persistent unmetabolized folic acid has been associated with altered immune function, masking of B12 deficiency, and functional folate imbalance in some individuals.

Low or undetectable folic acid typically reflects low intake of fortified foods or supplements and does not necessarily indicate poor folate status, as the body primarily uses active forms such as 5-MTHF, 5-Formyl-THF, and 10-Formyl-THF. Interpreting folic acid levels together with active folate markers helps distinguish between true folate deficiency, conversion issues, and excessive synthetic folate exposure.

This biomarker is particularly relevant for individuals with MTHFR or DHFR gene variants, those taking folic acid–containing supplements, and anyone evaluating methylation, fertility, neurological health, or homocysteine metabolism.

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What does it mean if your Folic Acid (LCMSMS) result is too high?

High folic acid levels indicate unmetabolized synthetic folate in the bloodstream, often due to supplementation, fortified food intake, or reduced ability to convert folic acid into active forms. Elevated levels may point to metabolic bottlenecks involving DHFR or MTHFR, nutrient imbalances, or high folate exposure. This marker should be interpreted with active folate derivatives and methylation biomarkers.

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What does it mean if your Folic Acid (LCMSMS) result is too low?

Low or undetectable folic acid levels usually indicate low intake of synthetic folic acid from supplements or fortified foods. This does not necessarily reflect low total folate status. Interpretation alongside active folate markers (such as 5-MTHF and 5-Formyl-THF) provides a clearer assessment of overall folate health.

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Folic Acid (LCMSMS)

All Your Lab Results. One Simple Dashboard.

What does it mean if your Folic Acid (LCMSMS) result is too high?

All Your Lab Results. One Simple Dashboard.

Import, Track, and Share Your Lab Results Easily

Import, Track, and Share Your Lab Results

What does it mean if your Folic Acid (LCMSMS) result is too low?

Article Review & Sources

Bring All Your Lab Results Together — In One Place

Gather Your Lab History — and Finally Make Sense of It

Finally, Your Lab Results Organized and Clear

Advanced Plan

Unlimited Account

Pro Monthly

What's included in a Healthmatters membership

Import Lab Results from Any Source

See Your Health Timeline

Understand What Your Results Mean

Enter Your Lab Reports Yourself — Always Free Enter Your Lab Reports — Always Free

Visualize Your Results

Export Your Complete Lab History in a Single File Export Your Complete Lab History

Comprehensive Data Entry Service for Your Reports Data Entry Service for Your Reports

Securely Share With Anyone You Trust

Let Your Lab Results Tell the Full Story

Once your results are in one place, see the bigger picture — track trends over time, compare data side by side, export your full history, and share securely with anyone you trust.

Bring all your results together to compare, track progress, export your history, and share securely.

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All Your Lab Results.
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