What Is a Folate Blood Test?

Folate (vitamin B9) is essential for DNA synthesis, red blood cell production, and preventing neural tube defects.

Normal Range

• 2–20 ng/mL (serum folate)
• Below 2 = deficient

Deficiency Causes

• Inadequate dietary intake
• Malabsorption (celiac, IBD)
• Alcohol use
• Medications (methotrexate, sulfasalazine)
• Increased demand (pregnancy)

Deficiency Symptoms

• Macrocytic anemia (large red cells)
• Fatigue
• Glossitis
• Neural tube defects in pregnancy

Food Sources

• Leafy greens
• Legumes
• Fortified grains
• Citrus fruits