Vitamins & minerals
Folic Acid
LOINC 2284-8 · ng/mL
Ranges
Reference range: 3–20 ng/mL
What it is
Folate (folic acid) is a B vitamin essential for making DNA, dividing cells and forming healthy red blood cells.
Why it matters
It is important for energy, red-cell production and, especially before and during pregnancy, healthy fetal development.
What high values can mean
A higher value usually reflects supplements and is generally not a concern.
What low values can mean
A lower value can cause a type of anemia and, in pregnancy, raises the risk of neural-tube defects.
How to improve it
Folate-rich foods and, when advised (especially in pregnancy), supplements restore levels.
Food & lifestyle
Leafy greens, legumes, citrus and fortified grains are rich in folate; cooking can reduce the amount.
Preparing for the test
A blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
Discuss low folate with a doctor, especially if pregnant or planning pregnancy.
Related markers
Sources
- MedlinePlus (NIH)
- NIH Office of Dietary Supplements
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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