Folinic Acid (WB)

Optimal Result: 9 - 35.5 nmol/L.

Folinic Acid (WB), also known as 5-Formyl-THF, is a biologically active, reduced folate form that does not require activation by the MTHFR enzyme. Because whole-blood measurements include red blood cells, this marker reflects long-term folate status, providing a more stable view of folate availability than serum testing.

Folinic acid plays a central role in DNA synthesis and repair, cellular replication, immune resilience, and one-carbon metabolism, serving as a key interconversion form in the folate cycle. It ensures that the body can generate other folate derivatives essential for metabolic balance, including 5-MTHF for methylation and 10-Formyl-THF for nucleotide synthesis. Adequate folinic acid levels support healthy gene expression, optimal detoxification, neurotransmitter balance, and red blood cell formation.

Levels may be influenced by dietary folate intake, B-vitamin status, gastrointestinal absorption, inflammation, oxidative stress, and genetic variations in folate enzymes such as MTHFR, MTHFD1, or DHFR. Low folinic acid may impair DNA repair, cellular recovery, and methylation efficiency. Elevated levels may reflect high folate intake, supplementation, or reduced conversion in other branches of the folate cycle.

Interpreting Folinic Acid (WB) alongside 5-MTHF, Active Folate (RBC), THF, 10-Formyl-THF, and methylation markers (SAM, SAH, SAM/SAH ratio) provides a detailed picture of folate-cycle performance and helps guide personalized nutritional strategies.

What does it mean if your Folinic Acid (WB) result is too high?

High Folinic Acid (WB) may reflect increased dietary folate or supplementation, enhanced whole-blood folate storage, or reduced conversion into other folate derivatives. Elevated levels can also signal imbalances elsewhere in the folate cycle. Reviewing this marker alongside active folate forms and methylation biomarkers provides the clearest interpretation.

What does it mean if your Folinic Acid (WB) result is too low?

Low Folinic Acid (WB) indicates reduced long-term folate availability, which may impair DNA repair, red blood cell production, and methylation support. Possible contributors include low dietary folate, malabsorption, chronic inflammation, oxidative stress, or genetic variations in folate metabolism. Low levels may be associated with fatigue, anemia risk, reduced immune function, and impaired tissue repair.

Frequently asked questions

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Yes, you can. When entering values for the biomarker, you will see an "Edit Range" button. Click this button, and you'll have the option to enter a custom range.

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Yes, you can! Go to the Graph view or Spreadsheet view. In the top-right corner, click "Export to Excel," and the file will be downloaded to your device.

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