Serum Folic Acid
- Sample Type
- Serum
- Fasting
- Required
- Unit
- ng/mL
Function
Serum Folic Acid (Vitamin B9) is essential for the synthesis of DNA and RNA, the production of red blood cells, and the metabolism of amino acids. It is particularly crucial during periods of rapid cell division and growth, such as pregnancy and fetal development. Because the human body cannot synthesize folate, it must be obtained through diet (leafy greens, fruits, beans) or supplementation.
Why it is Ordered
This test is primarily used to diagnose the cause of anemia, specifically 'Megaloblastic Anemia,' where red blood cells are abnormally large and poorly functioning. It is also ordered to assess nutritional status in patients with malabsorption syndromes (like Celiac disease), chronic alcoholism, or those taking medications that interfere with folate metabolism (such as methotrexate). Testing is also vital for women planning pregnancy to ensure adequate levels to prevent neural tube defects.
Associated Conditions
- Folate Deficiency Anemia: Leads to fatigue, weakness, and shortness of breath.
- Malabsorption Syndromes: Conditions like Crohn's disease or Celiac disease that prevent nutrient uptake.
- Neural Tube Defects: Low levels during early pregnancy are linked to spina bifida in infants.
- Vitamin B12 Deficiency: Folate and B12 are closely linked; high folate can mask the neurological symptoms of a B12 deficiency.
Measuring folate levels ensures that deficiencies are corrected before they lead to permanent neurological or hematological damage.
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
Serum folate is highly sensitive to recent dietary intake. A single meal high in folate (like fortified cereal or spinach) can temporarily normalize serum levels even in a person who is chronically deficient. For a more accurate reflection of long-term folate stores, clinicians often recommend a Red Blood Cell (RBC) Folate test or a second opinion to evaluate concurrent Vitamin B12 and Homocysteine levels, which provide a clearer picture of metabolic status.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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